add README.md with license note

README.md

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+# enjo-lib-python
+
+
+## License
+
+The enjo-lib-python library 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.
+
+The enjo-lib-python 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 the enjo-lib-python library.
+If not, see <https://www.gnu.org/licenses/>.