add credit

Author: kidwm

README.md

@@ -1,4 +1,19 @@
-star-pusher
+Star Pusher
 ===========
 
-A HTML5 Sokuban game
+A HTML5 Sokuban game
+
+Derived from original [Pygame version](http://inventwithpython.com/blog/2011/06/13/new-game-source-code-star-pusher-sokoban-clone/).
+
+
+PlanetCute
+----------
+
+["PlanetCute"](http://www.lostgarden.com/2007/05/dancs-miraculously-flexible-game.html) art by Daniel Cook (Lostgarden.com)
+
+[Creative Commons Attribution 3.0 License](http://www.lostgarden.com/2007/03/lost-garden-license.html)
+
+
+Microban
+--------
+Copyright: [David W Skinner](http://users.bentonrea.com/~sasquatch/sokoban/)