Update README

Mention that scaling is required.

Describe how to scale.

Describe how to install plugins.

README.md

@@ -1,8 +1,25 @@
-openshift-elasticsearch-cartridge
+OpenShift ElasticSearch Cartridge
 =================================
-Downloadable cartridge for OpenShift for ElasticSearch.
+Downloadable ElasticSearch cartridge for OpenShift.
+
+To create your scalable ElasticSearch app, run:
+
+    rhc app create <your app name> http://cartreflect-claytondev.rhcloud.com/github/ncdc/openshift-elasticsearch-cartridge -s
+
+**NOTE:** your app currently must be a scalable app or this cartridge will not run.
+
+
+Adding additional cluster nodes
+===============================
+To add more nodes to the cluster, simply add more gears:
+
+    rhc cartridge scale -a <your app name> elasticsearch <number of total gears you want>
+
+
+Plugins
+=======
+To install ElasticSearch plugins, edit the `plugins.txt` file, commit, and push your changes.
 
-TODO add more info
 
 License
 =======