Add a "201" walkthrough.

examples/walkthrough/replication-controller.yaml

@@ -0,0 +1,25 @@
+id: nginxController
+apiVersion: v1beta1
+kind: ReplicationController
+desiredState:
+  replicas: 2
+  # replicaSelector identifies the set of Pods that this
+  # replicaController is responsible for managing
+  replicaSelector:
+    name: nginx
+  # podTemplate defines the 'cookie cutter' used for creating
+  # new pods when necessary
+  podTemplate:
+    desiredState:
+      manifest:
+        version: v1beta1
+        id: ngix
+        containers:
+          - name: nginx
+            image: dockerfile/nginx
+            ports:
+              - containerPort: 80
+    # Important: these labels need to match the selector above
+    # The api server enforces this constraint.
+    labels:
+      - name: nginx