Add a Docker multi-node setup.

docs/getting-started-guides/docker.md

@@ -2,6 +2,9 @@
 
 The following instructions show you how to set up a simple, single node kubernetes cluster using Docker.
 
+Here's a diagram of what the final result will look like:
+![Kubernetes Single Node on Docker](k8s-singlenode-docker.png)
+
 ### Step One: Run etcd
 ```sh
 docker run --net=host -d kubernetes/etcd:2.0.5.1 /usr/local/bin/etcd --addr=127.0.0.1:4001 --bind-addr=0.0.0.0:4001 --data-dir=/var/etcd/data