add copyright blurb

README.rst

@@ -75,3 +75,22 @@ directory.  After you've done this, compile the updated translation::
     $ ./venv/bin/pybabel compile -d listsim/translations
 
 
+
+License
+-------
+
+Copyright 2013 Autistici/Inventati <info@autistici.org>.
+
+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/.
+