Add Snake to Projects that have used headtrackr

I also add some explaination to my demo ;)

README.md

@@ -47,7 +47,8 @@ To get some more idea about usage look at the source code for the examples above
 
 [![movembergames](http://auduno.github.com/headtrackr/examples/media/movembergames_thumbnail.png)](http://movembergames.com)
 [![street-facing](http://auduno.github.com/headtrackr/examples/media/street-facing_thumbnail.jpg)](https://github.com/alexhancock/street-facing)
+[![snake](http://nicolas-beauvais.com/Snake/thumbs.png)](http://nicolas-beauvais.com/Snake/)
 
 ### License ###
 
-Headtrackr.js is distributed under the [MIT License](http://www.opensource.org/licenses/MIT), and includes some code bits (courtesy [Liu Liu](https://github.com/liuliu) and Benjamin Jung) that are under the [BSD-3 License](http://www.opensource.org/licenses/BSD-3-Clause) and the [MIT License](http://www.opensource.org/licenses/MIT) respectively.
+Headtrackr.js is distributed under the [MIT License](http://www.opensource.org/licenses/MIT), and includes some code bits (courtesy [Liu Liu](https://github.com/liuliu) and Benjamin Jung) that are under the [BSD-3 License](http://www.opensource.org/licenses/BSD-3-Clause) and the [MIT License](http://www.opensource.org/licenses/MIT) respectively.