Add illustration in README

README.md

@@ -2,6 +2,8 @@
 
 A colorful platform 2D shooter with physics !
 
+![TinyShooter ally character](Pictures/Ally.png)
+
 ## Build
 
 You need `make`, `SDL1` and [Box2D](https://github.com/erincatto/box2d) to build this project.