Add helm-dependency example demonstrating customization of OTS chart

helm-dependency/Chart.yaml

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+name: wordpress

helm-dependency/README.md

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+# Helm Dependencies
+
+This example application demonstrates how an OTS (off-the-shelf) helm chart can be retrieved and
+pinned to a specific helm sem version from an upstream helm repository, and customized using a custom
+values.yaml in the private git repository.
+
+In this example, the wordpress application is pulled from the stable helm repo, and pinned to v5.0.2:
+
+```yaml
+dependencies:
+- name: wordpress
+  version: 5.0.2
+  repository: https://kubernetes-charts.storage.googleapis.com
+```
+
+A custom values.yaml is used to customize the parameters of the wordpress helm chart:
+
+```yaml
+wordpress:
+  wordpressPassword: foo
+  mariadb:
+    db:
+      password: bar
+    rootUser:
+      password: baz
+```

helm-dependency/requirements.yaml

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+dependencies:
+- name: wordpress
+  version: 5.0.2
+  repository: https://kubernetes-charts.storage.googleapis.com

helm-dependency/values.yaml

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+wordpress:
+  wordpressPassword: foo
+  mariadb:
+    db:
+      password: bar
+    rootUser:
+      password: baz