Merge pull request #1 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

Author: pdericson

README.md

@@ -1,5 +1,7 @@
 # mesos-master
 
+[![Join the chat at https://gitter.im/mesoscloud/mesos-master](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/mesoscloud/mesos-master?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 *Work in progress*
 
 ## centos