added licence

README

@@ -13,3 +13,21 @@ The file test.rb might include a few failing tests; this doesn't neccesarily mea
 If your changes are good, I'm not averse to adding them to the master version of Shintolin. E-mail me at: allthatyousee AT gmail DOT com and I'll see what I can do.
 
 Happy hacking!
+
+- - - - -
+
+    Shintolin - persistent browser-based multiplayer game
+    Copyright (C) 2010 Isaac Lewis
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.