Added SimpleAI and new category for AI (#108)

README.md

@@ -24,6 +24,7 @@ A list of game development resources to make **magic** happen. Created by awesom
   - [Engines and Frameworks](#engines-and-frameworks)
     - [2D](#2d)
     - [3D](#3d)
+  - [AI](#ai)
 - [Audio](#audio)
   - [Collections](#collections)
   - [Music and Audio Editors](#music-and-audio-editors)
@@ -47,7 +48,6 @@ Graphics
 
 #### Assets/Placeholders
 
-
 * [2D Cartoon Mobile Game UI Pack](http://graphicburger.com/mobile-game-gui/) - cartoon user interface asset pack. It comes as a layered psd file.
 * [420 Pixel Art Icons for RPGs](http://7soul1.deviantart.com/art/420-Pixel-Art-Icons-for-RPG-129892453) - Set of 420 RPG icons, free for commercial use.
 * [Blender 3D models](https://www.blender-models.com/) - 3D models, particle systems/effects
@@ -278,6 +278,10 @@ Code
 * [voxel.js](http://voxeljs.com/) - voxel.js is a collection of projects that make it easier than ever to create 3D voxel games like Minecraft all in the browser.
 with AWS and Twitch – with full source.
 
+### AI
+
+* [SimpleAI](https://github.com/mgerhardy/simpleai/) - C++11 behaviour tree based library with a QT5 based remote debugger (and with optional LUA bindings) released under MIT.
+
 Audio
 -----
 *Audio editors, sounds collections and more.*