Add license to README file

README

@@ -34,3 +34,23 @@ Run Machine Learning Training
 
 $ cd ./bin
 $ ./apprec.py --train
+
+License
+-------
+
+Copyright 2011 Tassia Cam�es Araujo <[email protected]>
+Copyright 2015-2016 Lucas Albuquerque Medeiros de Moura <[email protected]>
+Copyright 2015-2016 Luciano Prestes Cavalcanti <[email protected]>
+
+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/>.