Add Gitter badge

README.md

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 ![Urho3D logo](https://raw.githubusercontent.com/urho3d/Urho3D/master/bin/Data/Textures/LogoLarge.png)
 
 #Urho3D
+
+[![Join the chat at https://gitter.im/urho3d/Urho3D](https://badges.gitter.im/urho3d/Urho3D.svg)](https://gitter.im/urho3d/Urho3D?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 **Urho3D** is a free lightweight, cross-platform 2D and 3D game engine implemented in C++ and released under the MIT license. Greatly inspired by OGRE and Horde3D.
 
@@ -63,6 +65,7 @@ Urho3D development, contributions and bugfixes by:
 - OvermindDL1
 - Skrylar
 - TheComet93
+- Y-way
 - 1vanK
 - andmar1x
 - amadeus_osa