Update license and readme

LICENSE

@@ -1,3 +1,8 @@
+* Code is MPL licensed:
 This Source Code Form is subject to the terms of the Mozilla Public
 License, v. 2.0. If a copy of the MPL was not distributed with this file,
 You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+* Content is licensed under CC-BY-SA 3.0: 
+http://creativecommons.org/licenses/by-sa/3.0/

README.md

@@ -1,4 +1,25 @@
 BrowserQuest
 ============
 
-Documentation is located in client and server directories.
+BrowserQuest is a HTML5/JavaScript multiplayer game experiment.
+
+
+Documentation
+-------------
+
+Documentation is located in client and server directories.
+
+
+License
+-------
+
+Code is licensed under MPL 2.0. Content is licensed under CC-BY-SA 3.0.
+See the LICENSE file for details.
+
+
+Credits
+-------
+Created by [Little Workshop](http://www.littleworkshop.fr):
+
+* Franck Lecollinet - [@whatthefranck](http://twitter.com/whatthefranck)
+* Guillaume Lecollinet - [@glecollinet](http://twitter.com/glecollinet)