Add instructions on how to run the game

README.md

@@ -14,3 +14,15 @@ Some of the things I've used in this code that you may think is useful:
 1. [Directional light](https://github.com/visola/ShootTheBlocks/blob/master/js/objects/light.js) with shadows
 1. [Control the direction](https://github.com/visola/ShootTheBlocks/blob/master/js/controls/bullet.js) of the shooting using the keyboard
 1. [Control the camera](https://github.com/visola/ShootTheBlocks/blob/master/js/controls/camera.js) using the mouse
+
+## How to use this
+
+Download the code as .zip or clone this repository.
+
+To run the game you'll need a HTTP server. You can either put the files in your running HTTP server if you have
+one or use the simple one that comes with Python if you have Python installed:
+
+```
+$ cd /path/to/where/you/unzipped/the/files
+$ python -m SimpleHTTPServer
+```