Add coverage report

Author: lloydwatkin

README.md

@@ -6,7 +6,7 @@ A buddycloud server written in Java, implementing the [buddycloud channels](http
 
 Note this points to the main buddycloud repository for the java server.
 
-[![Build Status](https://travis-ci.org/buddycloud/buddycloud-server-java.png?branch=master)](https://travis-ci.org/buddycloud/buddycloud-server-java)
+[![Build Status](https://travis-ci.org/buddycloud/buddycloud-server-java.png?branch=master)](https://travis-ci.org/buddycloud/buddycloud-server-java) [![Coverage Status](https://img.shields.io/coveralls/buddycloud/buddycloud-server-java.svg)](https://coveralls.io/r/buddycloud/buddycloud-server-java)
 
 ## Coding Standards