add copyright holder info to license file

LICENSE.txt

@@ -1,4 +1,19 @@
-GNU GENERAL PUBLIC LICENSE
+Teletortoise web app
+Copyright (C) 2012 Uri Wilensky
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+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 General Public License for more details.
+
+===
+
+                    GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 
  Copyright (C) 1989, 1991 Free Software Foundation, Inc.,