Added LICENSE file

LICENSE

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+This file is part of django-admin-templates-twitter-bootstrap.
+
+django-admin-templates-twitter-bootstrap 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.
+
+django-admin-templates-twitter-bootstrap 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 django-admin-templates-twitter-bootstrap.  If not,
+see <http://www.gnu.org/licenses/>.