Add documentation

Author: jmarin

Documents/cluster.md

@@ -0,0 +1,6 @@
+# HMDA Akka Cluster Configuration
+
+## Cluster Management
+
+The project uses the [Akka Cluster HTTP Management](http://developer.lightbend.com/docs/akka-management/current/cluster-http-management.html) module to report on cluster member status as well as to perform cluster
+management tasks. Please refer to the documentation of this module for cluster management tasks (i.e. downing a node from the cluster)

README.md

@@ -72,7 +72,9 @@ In addition, you'll need Scala's interactive build tool [sbt](http://www.scala-s
 
 ## Building and Running
 
-The HMDA Platform uses sbt's multi-project builds, each project representing a specific task.
+The HMDA Platform uses sbt's multi-project builds, each project representing a specific task. The platform is an Akka Cluster
+application that can be deployed on a single node or as a distributed application. For more information on how Akka Cluster 
+is used, see the documentation [here](Documents/cluster.md)
 
 ### Interactive