Add doxygen configuration

Add a new "Documentation" folder that contains all configuration needed to run [Doxygen](http://www.stack.nl/~dimitri/doxygen/)

You will have to install Doxygen and run the generate.bat in a console to build the entire html document. The result is pretty clean and looks like this :
![capture](https://f.cloud.github.com/assets/1341236/1464496/ff569e92-4549-11e3-8791-7646aeadffc7.JPG)