[#18] Add License as AGPLv3+

README.md

@@ -135,3 +135,21 @@ Don't let this fool you. It looks like a stacked bar chart, but it's not
 drawn over each other. This almost always isn't what you want. To fix it, we
 need to support side-by-side bars, but we don't yet. If you'd like to help,
 check issue [#8](https://github.com/ckan/ckanext-basiccharts/issues/8).
+
+License
+-------
+
+Copyright (C) 2014 Open Knowledge Foundation
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.