Update README.md

README.md

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 # glPong [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 A clone of the Atari classic built with C++ and OpenGL using the GLFW and GLEW libraries.  Started as a small learning project while I was working my way through the OpenGL graphics API. For the math library, I ended up making my own 
 
+![glPongGIF](https://i.imgur.com/bcsNfhw.gif)
+
 ## Controls:
 - WASD - Left paddle
 - Arrow keys - Right paddle
@@ -10,3 +12,6 @@ A clone of the Atari classic built with C++ and OpenGL using the GLFW and GLEW l
 ## Build instructions
 Simply run the file `genproj.bat` and it will generate the necessary VS2022 project files. After that, simply open the solution with Visual Studio. If generating for an earlier version of Visual Studio, simply edit the file and repace 'vs2022' with your version.
 
+## Compatibility
+I only tested this with Windows but it should work on other systems as well.
+