Add note about calendar invites to templates

Signed-off-by: Eddie Zaneski <eddiezane@gmail.com>

committee-steering/README.md

@@ -13,6 +13,7 @@ The Kubernetes Steering Committee is the governing body of the Kubernetes projec
 The [charter](https://git.k8s.io/steering/charter.md) defines the scope and governance of the Steering Committee.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/a/kubernetes.io/forum/#!forum/steering) for the group will typically add invites for the following meetings to your calendar.*
 * Private Steering Committee Meeting: [third Mondays at 9:30 PT (Pacific Time)](https://bit.ly/k8s-steering-wd) (monthly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=9:30&tz=PT%20%28Pacific%20Time%29).
   * [Meeting recordings](https://www.youtube.com/watch?v=YAzgJRQxsdc&list=PL69nYSiGNLP1yP1B_nd9-drjoxp0Q14qM).
 * Public Steering Committee Meeting: [first Mondays at 9:30 PT (Pacific Time)](https://bit.ly/k8s-steering-wd) (monthly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=9:30&tz=PT%20%28Pacific%20Time%29).

generator/committee_readme.tmpl

@@ -8,6 +8,11 @@ The [charter]({{.CharterLink}}) defines the scope and governance of the {{.Name}
 {{- if .Meetings }}
 
 ## Meetings
+
+{{- if .Contact.MailingList }}
+*Joining the [mailing list]({{.Contact.MailingList}}) for the group will typically add invites for the following meetings to your calendar.*
+{{- end }}
+
 {{- range .Meetings }}
 * {{.Description}}: [{{.Day}}s at {{.Time}} {{.TZ}}]({{.URL}}) ({{.Frequency}}). [Convert to your timezone](http://www.thetimezoneconverter.com/?t={{.Time}}&tz={{.TZ | tzUrlEncode}}).
 {{- if .ArchiveURL }}

generator/sig_readme.tmpl

@@ -7,6 +7,11 @@ The [charter]({{.CharterLink}}) defines the scope and governance of the {{.Name}
 {{ end }}
 {{ if .Meetings -}}
 ## Meetings
+
+{{- if .Contact.MailingList }}
+*Joining the [mailing list]({{.Contact.MailingList}}) for the group will typically add invites for the following meetings to your calendar.*
+{{- end }}
+
 {{- range .Meetings }}
 * {{.Description}}: [{{.Day}}s at {{.Time}} {{.TZ}}]({{.URL}}) ({{.Frequency}}). [Convert to your timezone](http://www.thetimezoneconverter.com/?t={{.Time}}&tz={{.TZ | tzUrlEncode}}).
 {{- if .ArchiveURL }}

generator/ug_readme.tmpl

@@ -7,6 +7,11 @@ The [charter]({{.CharterLink}}) defines the scope and governance of the {{.Name}
 {{ end }}
 {{ if .Meetings -}}
 ## Meetings
+
+{{- if .Contact.MailingList }}
+*Joining the [mailing list]({{.Contact.MailingList}}) for the group will typically add invites for the following meetings to your calendar.*
+{{- end }}
+
 {{- range .Meetings }}
 * {{.Description}}: [{{.Day}}s at {{.Time}} {{.TZ}}]({{.URL}}) ({{.Frequency}}). [Convert to your timezone](http://www.thetimezoneconverter.com/?t={{.Time}}&tz={{.TZ | tzUrlEncode}}).
 {{- if .ArchiveURL }}

generator/wg_readme.tmpl

@@ -13,6 +13,11 @@ The [charter]({{.CharterLink}}) defines the scope and governance of the {{.Name}
 {{ end }}
 {{ if .Meetings -}}
 ## Meetings
+
+{{- if .Contact.MailingList }}
+*Joining the [mailing list]({{.Contact.MailingList}}) for the group will typically add invites for the following meetings to your calendar.*
+{{- end }}
+
 {{- range .Meetings }}
 * {{.Description}}: [{{.Day}}s at {{.Time}} {{.TZ}}]({{.URL}}) ({{.Frequency}}). [Convert to your timezone](http://www.thetimezoneconverter.com/?t={{.Time}}&tz={{.TZ | tzUrlEncode}}).
 {{- if .ArchiveURL }}

sig-api-machinery/README.md

@@ -13,6 +13,7 @@ Covers all aspects of API server, API registration and discovery, generic API CR
 The [charter](charter.md) defines the scope and governance of the API Machinery Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-api-machinery) for the group will typically add invites for the following meetings to your calendar.*
 * Kubebuilder and Controller Runtime Meeting: [Thursdays at 09:00 PT (Pacific Time)]() (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=09:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1Ih-2cgg1bUrLwLVTB9tADlPcVdgnuMNBGbUl4D-0TIk/edit?usp=sharing).
 * Regular SIG Meeting: [Wednesdays at 11:00 PT (Pacific Time)](https://zoom.us/my/apimachinery) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=11:00&tz=PT%20%28Pacific%20Time%29).

sig-apps/README.md

@@ -13,6 +13,7 @@ Covers deploying and operating applications in Kubernetes. We focus on the devel
 The [charter](charter.md) defines the scope and governance of the Apps Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-apps) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Mondays at 9:00 PT (Pacific Time)](https://zoom.us/j/739385290?pwd=ekVmNGRjT214MGJkY1JUUUpPMVlJUT09) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=9:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1LZLBGW2wRDwAfdBNHJjFfk9CFoyZPcIYGWU7R1PQ3ng/edit#).
   * [Meeting recordings](https://www.youtube.com/playlist?list=PL69nYSiGNLP2LMq7vznITnpd2Fk1YIZF3).

sig-architecture/README.md

@@ -13,6 +13,7 @@ The Architecture SIG maintains and evolves the design principles of Kubernetes,
 The [charter](charter.md) defines the scope and governance of the Architecture Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-architecture) for the group will typically add invites for the following meetings to your calendar.*
 * Enhancements Subproject Meeting: [Thursdays at 10:00 PT (Pacific Time)](https://zoom.us/j/95357819945) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=10:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://bit.ly/k8s-enhancements-agenda).
   * [Meeting recordings](TBD).

sig-auth/README.md

@@ -15,6 +15,7 @@ Covers improvements to Kubernetes authorization, authentication, and cluster sec
 The [charter](charter.md) defines the scope and governance of the Auth Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-auth) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Wednesdays at 11:00 PT (Pacific Time)](https://zoom.us/j/264572674) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=11:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1woLGRoONE3EBVx-wTb4pvp4CI7tmLZ6lS26VTbosLKM/edit#).
   * [Meeting recordings](https://www.youtube.com/playlist?list=PL69nYSiGNLP0VMOZ-V7-5AchXTHAQFzJw).

sig-autoscaling/README.md

@@ -13,6 +13,7 @@ Covers development and maintenance of components for automated scaling in Kubern
 The [charter](charter.md) defines the scope and governance of the Autoscaling Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-autoscaling) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Mondays at 16:00 Poland](https://zoom.us/j/944410904) (weekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=16:00&tz=Poland).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1RvhQAEIrVLHbyNnuaT99-6u9ZUMp7BfkPupT2LAZK7w/edit).
 

sig-cli/README.md

@@ -13,6 +13,7 @@ Covers kubectl and related tools. We focus on the development and standardizatio
 The [charter](charter.md) defines the scope and governance of the CLI Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-cli) for the group will typically add invites for the following meetings to your calendar.*
 * Bug Scrub: [Wednesdays at 09:00 PT (Pacific Time)](https://zoom.us/j/288426795?pwd=UDdoYnFyNjBiS1RHcXRxS1BCNy9wUT09) (monthly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=09:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1r0YElcXt6G5mOWxwZiXgGu_X6he3F--wKwg-9UBc29I/edit?usp=sharing).
   * [Meeting recordings](https://www.youtube.com/playlist?list=PL69nYSiGNLP28HaTzSlFe6RJVxpFmbUvF).

sig-cloud-provider/README.md

@@ -13,6 +13,7 @@ Ensures that the Kubernetes ecosystem is evolving in a way that is neutral to al
 The [charter](CHARTER.md) defines the scope and governance of the Cloud Provider Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-cloud-provider) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Wednesdays at 13:00 PT (Pacific Time)](https://zoom.us/j/508079177?pwd=ZmEvMksxdTFTc0N1eXFLRm91QUlyUT09) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=13:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1OZE-ub-v6B8y-GuaWejL-vU_f9jsjBbrim4LtTfxssw/edit#heading=h.w7i4ksrweimp).
   * [Meeting recordings](https://www.youtube.com/playlist?list=PL69nYSiGNLP3dXLcYbRKCbpPCN-8CDFAB).

sig-cluster-lifecycle/README.md

@@ -13,6 +13,7 @@ The Cluster Lifecycle SIG examines how we should change Kubernetes to make it ea
 The [charter](charter.md) defines the scope and governance of the Cluster Lifecycle Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-cluster-lifecycle) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Tuesdays at 09:00 PT (Pacific Time)](https://zoom.us/j/916523531?pwd=eVhPNU5IQWtBYWhmT1N4T0V6bHZFZz09) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=09:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1Gmc7LyCIL_148a9Tft7pdhdee0NBHdOfHS1SAF0duI4/edit).
   * [Meeting recordings](https://www.youtube.com/playlist?list=PL69nYSiGNLP29D0nYgAGWt1ZFqS9Z7lw4).

sig-contributor-experience/README.md

@@ -13,6 +13,7 @@ Developing and sustaining a healthy community of contributors is critical to sca
 The [charter](charter.md) defines the scope and governance of the Contributor Experience Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-contribex) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Wednesdays at 9:00 PT (Pacific Time)](https://zoom.us/j/397264241?pwd=bHNnZVArNFdPaWVJMmttdko0Sktudz09) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=9:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1CBz8qV_mD6rbDmTsMuosTOQGRXGhN3d8UrcULUI6Vkw/edit).
   * [Meeting recordings](https://www.youtube.com/watch?v=EMGUdOKwSns&list=PL69nYSiGNLP2x_48wbOPO0vXQgNTm_xxr).

sig-docs/README.md

@@ -13,6 +13,7 @@ Covers documentation, doc processes, and doc publishing for Kubernetes.
 The [charter](charter.md) defines the scope and governance of the Docs Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-docs) for the group will typically add invites for the following meetings to your calendar.*
 * APAC SIG Meeting: [Wednesdays at 01:00 UTC](https://docs.google.com/document/d/1emuO4nmaQq3K8JZ9-MQeIygtrCPO9kWv7U7RzTaW4F8/edit) (monthly - Wednesday, after the fourth Tuesday, every month). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=01:00&tz=UTC).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1ddHwLK3kUMX1wVFIwlksjTk0MsqitBnWPe1LRa1Rx5A/edit).
   * [Meeting recordings](https://www.youtube.com/playlist?list=PL69nYSiGNLP3b5hlx0YV7Lo7DtckM84y8).

sig-instrumentation/README.md

@@ -13,6 +13,7 @@ Covers best practices for cluster observability through metrics, logging, and ev
 The [charter](charter.md) defines the scope and governance of the Instrumentation Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-instrumentation) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Thursdays at 9:30 PT (Pacific Time)](https://zoom.us/j/5342565819?pwd=RlVsK21NVnR1dmE3SWZQSXhveHZPdz09) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=9:30&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1FE4AQ8B49fYbKhfg4Tx0cui1V0eI4o3PxoqQPUwNEiU/edit?usp=sharing).
 * Regular Triage Meeting: [Thursdays at 9:30 PT (Pacific Time)](https://zoom.us/j/5342565819?pwd=RlVsK21NVnR1dmE3SWZQSXhveHZPdz09) (biweekly - alternating with regular meeting). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=9:30&tz=PT%20%28Pacific%20Time%29).

sig-k8s-infra/README.md

@@ -14,6 +14,7 @@ In other words, we seek to eradicate usage of the phrase "oh that's something th
 The [charter](charter.md) defines the scope and governance of the K8s Infra Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-k8s-infra) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Wednesdays at 20:00 UTC](https://zoom.us/j/93109963352?pwd=SHJTcFR2bVg1akYxSDREUWQzaldrQT09) (bi-weekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=20:00&tz=UTC).
   * [Meeting notes and Agenda](http://bit.ly/sig-k8s-infra-notes).
   * [Meeting recordings](http://bit.ly/sig-k8s-infra-playlist).

sig-multicluster/README.md

@@ -13,6 +13,7 @@ A Special Interest Group focused on solving common challenges related to the man
 The [charter](charter.md) defines the scope and governance of the Multicluster Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-multicluster) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Tuesdays at 9:30 PT (Pacific Time)](https://zoom.us/my/k8s.mc) (bi-weekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=9:30&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://tinyurl.com/sig-multicluster-notes).
   * [Meeting recordings](https://www.youtube.com/playlist?list=PL69nYSiGNLP0HqgyqTby6HlDEz7i1mb0-).

sig-network/README.md

@@ -13,6 +13,7 @@ Covers networking in Kubernetes.
 The [charter](charter.md) defines the scope and governance of the Network Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-network) for the group will typically add invites for the following meetings to your calendar.*
 * Gateway API Meeting: [Mondays at 15:00 PT (Pacific Time)](https://zoom.us/j/441530404) (weekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=15:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1eg-YjOHaQ7UD28htdNxBR3zufebozXKyI28cl2E11tU/edit).
 * Network Policy API Meeting: [Mondays at 13:00 PT (Pacific Time)](https://zoom.us/j/96264742248) (weekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=13:00&tz=PT%20%28Pacific%20Time%29).

sig-node/README.md

@@ -13,6 +13,7 @@ SIG Node is responsible for the components that support the controlled interacti
 The [charter](charter.md) defines the scope and governance of the Node Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-node) for the group will typically add invites for the following meetings to your calendar.*
 * Main SIG Meeting: [Tuesdays at 10:00 PT (Pacific Time)](https://zoom.us/j/4799874685) (weekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=10:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1Ne57gvidMEWXR70OxxnRkYquAoMpt56o75oZtg-OeBg/edit?usp=sharing).
   * [Meeting recordings](https://www.youtube.com/playlist?list=PL69nYSiGNLP1wJPj5DYWXjiArF-MJ5fNG).

sig-release/README.md

@@ -13,6 +13,7 @@ Ensure quality Kubernetes releases
 The [charter](charter.md) defines the scope and governance of the Release Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-release) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Tuesdays at 14:30 UTC](https://zoom.us/j/327142148?pwd=RE9aZWtCc0hhOWs4ZTdXZ0hBM0ROdz09) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=14:30&tz=UTC).
   * [Meeting notes and Agenda](https://bit.ly/k8s-sig-release-meeting).
   * [Meeting recordings](https://bit.ly/k8s-sig-release-videos).

sig-scalability/README.md

@@ -13,6 +13,7 @@ SIG Scalability is responsible for defining and driving scalability goals for Ku
 The [charter](charter.md) defines the scope and governance of the Scalability Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-scale) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Thursdays at 10:30 PT (Pacific Time)](https://zoom.us/j/94252896018?pwd=cTlMMlBoTHZqUEdjRm9VY2NWNUg5dz09) (bi-weekly ([upcoming meeting dates](#upcoming-meeting-dates))). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=10:30&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/a/bobsplanet.com/document/d/1hEpf25qifVWztaeZPFmjNiJvPo-5JX1z0LSvvVY5G2g/edit?usp=drive_web).
   * [Meeting recordings](https://www.youtube.com/watch?v=NDP1uYyom28&list=PL69nYSiGNLP2X-hzNTqyELU6jYS3p10uL).

sig-scheduling/README.md

@@ -13,6 +13,7 @@ SIG Scheduling is responsible for the components that make Pod placement decisio
 The [charter](charter.md) defines the scope and governance of the Scheduling Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-scheduling) for the group will typically add invites for the following meetings to your calendar.*
 * 10AM PT Meeting: [Thursdays at 17:00 UTC](https://zoom.us/j/841218129) (biweekly starting Thursday June 7, 2018). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=17:00&tz=UTC).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/13mwye7nvrmV11q9_Eg77z-1w3X7Q1GTbslpml4J7F3A/edit).
   * [Meeting recordings](https://www.youtube.com/watch?v=PweKj6SU7UA&list=PL69nYSiGNLP2vwzcCOhxrL3JVBc-eaJWI).

sig-security/README.md

@@ -13,6 +13,7 @@ Covers horizontal security initiatives for the Kubernetes project, including reg
 The [charter](charter.md) defines the scope and governance of the Security Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-security) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Thursdays at 9:00 PT (Pacific Time)](https://zoom.us/j/9934z1184192?pwd=L25Tc0ZOL3FqU09KNERlTU12dFhTQT09) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=9:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/1GgmmNYN88IZ2v2NBiO3gdU8Riomm0upge_XNVxEYXp0/edit?usp=sharing).
   * [Meeting recordings](https://www.youtube.com/playlist?list=PL69nYSiGNLP1mXOLAc9ti0oX8s_ookQCi).

sig-service-catalog/README.md

@@ -13,6 +13,7 @@ Service Catalog is a Kubernetes extension project that implements the [Open Serv
 The [charter](charter.md) defines the scope and governance of the Service Catalog Special Interest Group.
 
 ## Meetings
+*Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-service-catalog) for the group will typically add invites for the following meetings to your calendar.*
 * Regular SIG Meeting: [Mondays at 10:00 PT (Pacific Time)](https://zoom.us/j/7201225346) (biweekly). [Convert to your timezone](http://www.thetimezoneconverter.com/?t=10:00&tz=PT%20%28Pacific%20Time%29).
   * [Meeting notes and Agenda](https://docs.google.com/document/d/17xlpkoEbPR5M6P5VDzNx17q6-IPFxKyebEekCGYiIKM/edit).
   * [Meeting recordings](https://www.youtube.com/watch?v=ukPj1sFFkr0&list=PL69nYSiGNLP2k9ZXx9E1MvRSotFDoHUWs).