add example

example-charts/use-yaml-file/Chart.yaml

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+apiVersion: v1
+name: no-values
+description: A very simple chart that doesn't even need any values for customization
+version: "0.2.0"
+home: "https://github.com/norwoodj/helm-docs/tree/master/example-charts/no-values"
+sources: ["https://github.com/norwoodj/helm-docs/tree/master/example-charts/no-values"]
+engine: gotpl
+maintainers:
+  - email: norwood.john.m@gmail.com
+    name: John Norwood

example-charts/use-yaml-file/README.md

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+# no-values
+
+A very simple chart that doesn't even need any values for customization
+
+![Version: 0.2.0](https://img.shields.io/badge/Version-0.2.0-informational?style=flat-square)
+
+## Additional Information
+
+### Snapshot classes
+
+| name     | resource group | incremental |
+|----------|----------------|-------------|
+| azure-incr | true |  |
+| azure | false |  |
+| local-incr | true |  |
+| local | false |  |
+| mask-data-incr | true | rg-mask-data |
+| mask-data | false | rg-mask-data |
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```console
+$ helm repo add foo-bar http://charts.foo-bar.com
+$ helm install my-release foo-bar/no-values
+```
+
+## Values
+
+| Key | Type | Default | Description |
+|-----|------|---------|-------------|
+| volumeSnapshotClass.azure.parameters | object | `{}` |  |
+| volumeSnapshotClass.local.parameters | object | `{}` |  |
+| volumeSnapshotClass.mask-data.parameters.resourceGroup | string | `"rg-mask-data"` |  |
+

example-charts/use-yaml-file/README.md.gotmpl

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+{{ template "chart.header" . }}
+{{ template "chart.description" . }}
+
+{{ template "chart.versionBadge" . }}{{ template "chart.typeBadge" . }}{{ template "chart.appVersionBadge" . }}
+
+## Additional Information
+
+{{ $values := (.Files.Get "values.yaml") | fromYaml }}
+
+### Snapshot classes
+
+| name     | resource group | incremental |
+|----------|----------------|-------------|
+{{- range $name, $spec := $values.volumeSnapshotClass }}
+{{- range $parameterIncr := list "true" "false" }}
+| {{ $name }}{{- if eq $parameterIncr "true" -}}-incr{{- end }} | {{ $parameterIncr }} | {{ $spec.parameters.resourceGroup | default "" }} |
+{{- end }}
+{{- end }}
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```console
+$ helm repo add foo-bar http://charts.foo-bar.com
+$ helm install my-release foo-bar/{{ template "chart.name" . }}
+```
+
+{{ template "chart.requirementsSection" . }}
+
+{{ template "chart.valuesSection" . }}
+
+{{ template "helm-docs.versionFooter" . }}

example-charts/use-yaml-file/values.yaml

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+volumeSnapshotClass:
+  azure:
+    parameters: {}
+
+  local:
+    parameters: {}
+
+  mask-data:
+    parameters:
+      resourceGroup: rg-mask-data