Add example for secrets

examples/secrets/README.md

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+# Secrets example
+
+Following this example, you will create a secret and a pod that consumes that secret in a volume.
+
+## Step Zero: Prerequisites
+
+This example assumes you have a Kubernetes cluster installed and running, and that you have
+installed the ```kubectl``` command line tool somewhere in your path. Please see the [getting
+started](../../docs/getting-started-guides) for installation instructions for your platform.
+
+## Step One: Create the secret
+
+A secret contains a set of named byte arrays.
+
+Use the `examples/secrets/secret.yaml` file to create a secret:
+
+```shell
+$ kubectl create -f examples/secrets/secret.yaml
+```
+
+You can use `kubectl` to see information about the secret:
+
+```shell
+$ kubectl get secrets
+NAME          TYPE      DATA
+test-secret   Opaque    2
+```
+
+## Step Two: Create a pod that consumes a secret
+
+Pods consume secrets in volumes.  Now that you have created a secret, you can create a pod that
+consumes it.
+
+Use the `examples/secrets/secret-pod.yaml` file to create a Pod that consumes the secret.
+
+```shell
+$ kubectl create -f examples/secrets/secret-pod.yaml
+```
+
+This pod runs a binary that displays the content of one of the pieces of secret data in the secret
+volume: 
+
+```shell
+$ kubectl log secret-test-pod
+2015-04-29T21:17:24.712206409Z content of file "/etc/secret-volume/data-1": value-1
+```

examples/secrets/secret-pod.yaml

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+apiVersion: v1beta3
+kind: Pod
+metadata:
+  name: secret-test-pod
+spec:
+  containers:
+    - name: test-container
+      image: kubernetes/mounttest:0.1
+      command: [ "/mt", "--file_content=/etc/secret-volume/data-1" ]
+      volumeMounts:
+          # name must match the volume name below
+          - name: secret-volume
+            mountPath: /etc/secret-volume
+  volumes:
+    - name: secret-volume
+      secret:
+        secretName: test-secret
+  restartPolicy: Never

examples/secrets/secret.yaml

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+apiVersion: v1beta3
+kind: Secret
+metadata:
+  name: test-secret
+data:
+  data-1: dmFsdWUtMQ0K
+  data-2: dmFsdWUtMg0KDQo=