Added Gitter badge

Author: gitter-badger

README.md

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 NOTE: THIS NEEDS TO BE FIXED.... PLEASE JUST USE THE LATEST RELEASE AND NOT THE MASTER BRANCH!!!!
 # IRremote Arduino Library
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 This library enables you to send and receive using infra-red signals on an arduino.
 
 Check [here](http://shirriff.github.io/Arduino-IRremote/) for tutorials and more information.