Add license

README.rst

@@ -40,3 +40,20 @@ Authors
 -------
 
 This tool was written by Michal Čihař <michal@cihar.com>.
+
+License
+-------
+
+Copyright (C) 2012 Michal Čihař <michal@cihar.com>
+
+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 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program.  If not, see <http://www.gnu.org/licenses/>.