Update README.md

Author: mariobehling

README.md

@@ -140,3 +140,7 @@ Please help us follow the best practice to make it easy for the reviewer as well
 *   Jaideep Prasad ([@jddeep](https://github.com/jddeep))
 *   Mario Behling ([@mariobehling](http://github.com/mariobehling))
 *   Padmal ([@CloudyPadmal](https://github.com/CloudyPadmal))
+
+## License
+
+This project is licensed under the GNU General Public License v3.0. A copy of [LICENSE](LICENSE) is to be present along with the source code. To obtain the software under a different license, please contact FOSSASIA.