Add license GPL

license.txt

@@ -0,0 +1,19 @@
+"None are so hopelessly enslaved as those who falsely believe they are free."
+                                              Johann Wolfgang von Goethe
+
+Copyright (C) 2012 Tito Bouzout <tito.bouzout@gmail.com>
+
+This license apply to all the files inside this program unless noted
+different for some files or portions of code inside these files.
+
+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. http://www.gnu.org/licenses/gpl.html
+
+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/gpl.html