adding more info to Digital Ocean doc page (RocketChat#1470)

* adding more info to Digital Ocean doc page

* possible changes to motd

* changes to motd

* fix trailing whitespace

Author: LuluGO

installation/paas-deployments/digital-ocean/README.md

@@ -4,3 +4,67 @@ You can now install Rocket.Chat on DigitalOcean using a 1-Click install from the
 
 [![do-btn-blue](https://user-images.githubusercontent.com/51996/58146107-50512580-7c1a-11e9-8ec9-e032ba387c2a.png)](https://marketplace.digitalocean.com/apps/rocket-chat?action=deploy&refcode=1940fe28bd31)
 
+---
+
+After you create your 1-Click install using the Rocket.Chat app in DigitalOcean Marketplace, you'll likely want a registered domain name to access Rocket.Chat.
+
+We recommend setting up an A record from your domain to your servers IP address. Ex: chat.mycompany.com
+
+Rocket.Chat will not work with HTTPS out of the box because certificates are unique for each instalation, but with this setup HTTPS will be available using Let's Encrypt certificates.
+
+After the Rocket.Chat One-Click is finished and your domain is setup. You will need to login to your droplet to finish setup.
+
+```
+ssh root@your_droplet_ip
+```
+
+Once you are connected you should see something like:
+
+```
+Rocket.Chat is the leading open source team chat software solution. Free, unlimited and completely customizable with on-premises and SaaS cloud hosting.
+Replace email, HipChat & Slack with the ultimate team chat software solution.
+
+  Out of the box you can access Rocket.Chat server at: http://Droplet-IP:3000
+
+ You will likely want a registered domain name to access Rocket.Chat. If you would like your server to be accessible over https we provide the option to use letsencrypt by running:
+  # rocketchatctl configure --lets-encrypt --root-url=https://chat.yourcompany.com --letsencrypt-email=admin@yourcompany.com
+
+ In case you do not own a registered domain, you could use the public IP of your droplet, but traefik will not be able to fetch certificates for you so you will see a privacy alert message when loading https://droplet-IP
+  # rocketchatctl configure --lets-encrypt --root-url=https://droplet-IP --letsencrypt-email=admin@yourcompany.com
+
+ If you would like https with something other than letsencrypt provided certificates you will have to manually edit the traefik config to add it.
+
+ In case you do own a registered domain, but you do not want to use traefik, you can just configure your site URL running:
+  # rocketchatctl configure --rocketchat --root-url=http://chat.yourcompany.com:3000
+
+ Keep your RocketChat server updated using rocketchatctl update. Run rocketchatctl -h to see the full list of available options.
+
+ Looking for how to use Rocket.Chat? Be sure to check our docs: https://rocket.chat/docs
+
+ Checkout our Digital Ocean docs: https://rocket.chat/docs/installation/paas-deployments/digital-ocean/
+
+ Need some help? Join our community forums https://forums.rocket.chat
+```
+
+Besides the recommended setup you can out of the box access Rocket.Chat server at: [http://Droplet-IP:3000](<http://Droplet-IP:3000>)
+
+## Setting up HTTPS
+
+We recommend you to finish the Traefik loadbalancer configuration to handle HTTPS. Run this command to fetch Let's Encrypt certificates for your installation:
+
+```
+rocketchatctl configure --lets-encrypt --root-url=https://chat.yourcompany.com --letsencrypt-email=admin@yourcompany.com
+```
+
+You can then access at: [https://chat.yourcompany.com](<https://chat.yourcompany.com>) replacing chat.yourcompany.com with the address you set in your DNS.
+
+The Loadbalancer will redirect HTTP to HTTPS
+
+## Firewall
+
+This image comes with a ufw firewall enabled and the ports allowed for incomingo traffic are:
+
+- ssh 22
+- http 80
+- https 443
+- rocketchat 3000