Merge pull request #2155 from yichengq/310

README: add doc about easy etcd cluster bootstrap

README.md

@@ -40,7 +40,7 @@ The latest release and setup instructions are available at [GitHub][github-relea
 
 ### Running etcd
 
-First start a single-machine cluster of etcd:
+First start a single-member cluster of etcd:
 
 ```sh
 ./bin/etcd
@@ -55,10 +55,26 @@ curl -L http://127.0.0.1:4001/v2/keys/mykey -XPUT -d value="this is awesome"
 curl -L http://127.0.0.1:4001/v2/keys/mykey
 ```
 
-You have successfully started an etcd on a single machine and written a key to the store. Now it's time to dig into the full etcd API and other guides.
+You have successfully started an etcd and written a key to the store.
+
+### Running local etcd cluster
+
+First install [goreman](https://github.com/mattn/goreman), which manages Procfile-based applications.
+
+Our [Profile script](./Procfile) will set up a local example cluster. You can start it with:
+
+```sh
+goreman start
+```
+
+This will bring up 3 etcd members `infra1`, `infra2` and `infra3` and etcd proxy `proxy`, which runs locally and composes a cluster.
+
+You can write a key to the cluster and retrieve the value back from any member or proxy.
 
 ### Next Steps
 
+Now it's time to dig into the full etcd API and other guides.
+
 - Explore the full [API][api].
 - Set up a [multi-machine cluster][clustering].
 - Learn the [config format, env variables and flags][configuration].