Document some dependencies

README.md

@@ -4,6 +4,12 @@
 
 # Quick Start
 
+## Dependencies
+
+- [SDL2 2.0.9+](https://www.libsdl.org/)
+- [FreeType 2.13.0+](https://freetype.org/)
+- [GLEW 2.1.0+](https://glew.sourceforge.net/)
+
 ## POSIX
 
 ```console