Add more details to readme

Author: cosme12

README.md

@@ -1,2 +1,15 @@
 # PyPong
 A simple Pong like game tutorial in Pygame - Python
+For an extensive tutorial of how it works, take a look at [PyPong tutorial Part 1](http://copitosystem.com)
+
+## How to run it
+
+First, install ```requirements.txt```.
+
+```
+pip install -r requirements.txt
+```
+
+## Pictures of the game
+
+![pong game in python](https://k50.kn3.net/8/8/5/7/8/2/9F5.png)