Merge pull request #467 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

Author: barbeau

README.md

@@ -1,6 +1,8 @@
 OpenTripPlanner for Android [![Build Status](https://travis-ci.org/CUTR-at-USF/OpenTripPlanner-for-Android.svg?branch=master)](https://travis-ci.org/CUTR-at-USF/OpenTripPlanner-for-Android)
 ===========================
 
+[![Join the chat at https://gitter.im/CUTR-at-USF/OpenTripPlanner-for-Android](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/CUTR-at-USF/OpenTripPlanner-for-Android?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 An Android app for multi-modal trip planning and navigation using any OpenTripPlanner server.
 
 Download the app via the [Google Play store](https://play.google.com/store/apps/details?id=edu.usf.cutr.opentripplanner.android).