Graphics: Add DirectXTK

Author: myd7349

README.md

@@ -322,6 +322,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 
 * [bgfx](https://github.com/bkaradzic/bgfx) - A cross-platform rendering library. [BSD]
 * [Cairo](http://www.cairographics.org/) - A 2D graphics library with support for multiple output devices. [LGPL2 or Mozilla MPL]
+* [DirectXTK](https://github.com/Microsoft/DirectXTK) - A collection of helper classes for writing DirectX 11.x code in C++. [MIT]
 * [GLFW](https://github.com/glfw/glfw) - A simple, cross-platform OpenGL wrangling library. [zlib/libpng]
 * [Horde3D](https://github.com/horde3d/Horde3D) - A small 3D rendering and animation engine. [EPL]
 * [Irrlicht](http://irrlicht.sourceforge.net/) - A high performance realtime 3D engine written in C++. [zlib]