Add Gitter badge

gitter-badger · gitter-badger · commit e952b4f559b7 · 2015-11-16T15:43:34.000Z
diff --git a/README.md b/README.md
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 ## AngularJS slider directive with no external dependencies
 
+[![Join the chat at https://gitter.im/rzajac/angularjs-slider](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/rzajac/angularjs-slider?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 Slider directive implementation for AngularJS, without any dependencies.
 
 - Mobile friendly
