Note about pygame module install

PyGame/README.md

@@ -1,3 +1,12 @@
 # PyGame Python Examples
 
 This folder contains simple examples of using PyGame in Python to create simple UI tools or "game like" programs.
+
+## Prerequesits
+
+All of these projects require the PyGame module.
+
+Inside a terminal:
+```
+pip install pygame
+```