Merge pull request fffaraz#177 from oxygine/master

Update README.md

Author: fffaraz

README.md

@@ -252,6 +252,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [Godot](https://github.com/godotengine/godot) - A fully featured, open source, MIT licensed, game engine. [MIT]
 * [Grit](http://www.gritengine.com/) - Community project to build a free game engine for implementing open world 3D games. [MIT]
 * [Irrlicht](http://irrlicht.sourceforge.net/) - A high performance realtime 3D engine written in C++. [zlib]
+* [Oxygine](http://oxygine.org/) - A cross-platform 2D C++ game engine. [MIT]
 * [Panda3D](https://github.com/panda3d/panda3d) - A game engine, a framework for 3D rendering and game development for Python and C++ programs. [Modified BSD] [website](https://www.panda3d.org/)
 * [Polycode](https://github.com/ivansafrin/Polycode) - A cross-platform framework for creative code in C++ (with Lua bindings). [MIT] [website](http://polycode.org/)
 * [Torque2D](https://github.com/GarageGames/Torque2D) - An open-source and cross-platform C++ engine built for 2D game development. [MIT] [website](https://www.garagegames.com/products/torque-2d)