Add config template plugin examples (#7)

plugins/kustomized-helm/.gitignore

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+all.yaml
+charts
+requirements.lock

plugins/kustomized-helm/Chart.yaml

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+name: guestbook

plugins/kustomized-helm/README.md

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+# Helm + Kustomize
+
+Sometimes Helm chart don't have all required parameters and additional customization is required. This example application demonstrates how to combine Helm and Kustomize and use it
+as a config management plugin in Argo CD.
+
+Use following steps to try the application:
+
+* configure `kustomized-helm` tool in `argocd-cm` ConfigMap:
+
+```yaml
+  configManagementPlugins: |
+    - name: kustomized-helm
+      init:
+        command: [helm, dependency, build]
+      generate:
+        command: [sh, -c]
+        args: ["helm template . > all.yaml && kustomize build"]
+```
+
+* create application using `kustomized-helm` as a config management plugin name:
+
+
+```
+argocd app create kustomized-helm \
+    --config-management-plugin kustomized-helm \
+    --repo https://github.com/argoproj/argocd-example-apps \
+    --path plugins/kustomized-helm \
+    --dest-server https://kubernetes.default.svc \
+    --dest-namespace default
+```

plugins/kustomized-helm/kustomization.yaml

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+namePrefix: kustomize-
+
+resources:
+- ./all.yaml
+
+patches:
+- overlays/guestbook-deployment.yaml

plugins/kustomized-helm/overlays/guestbook-deployment.yaml

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+apiVersion: apps/v1beta2
+kind: Deployment
+metadata:
+  name: release-name-helm-guestbook
+spec:
+  template:
+    spec:
+      containers:
+        - name: helm-guestbook
+          image: "gcr.io/heptio-images/ks-guestbook-demo:0.2"

plugins/kustomized-helm/requirements.yaml

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+dependencies:
+- name: helm-guestbook
+  version: 0.1.0
+  repository: file://../../helm-guestbook