Added Gitter badge

Author: gitter-badger

README.md

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 # meteor-reactjs
 
+[![Join the chat at https://gitter.im/hipertracker/meteor-reactjs](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/hipertracker/meteor-reactjs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 [Meteor](http://meteor.com) smart package integrating [React](http://facebook.github.io/react/) for both client and the server, to complement or replace the default [Blaze](https://www.meteor.com/blaze) templating system. [React.addons](http://facebook.github.io/react/docs/addons.html) are enabled. [JSX](http://facebook.github.io/react/docs/jsx-in-depth.html) is using ES6 transforms (--harmony) as well.
 
 ## Usage