add license to README.md

README.md

@@ -45,3 +45,20 @@ sudo make purge
 # or if you want to keep the config file:
 sudo make uninstall
 ```
+
+## License
+
+Copyright (C) 2025 perry
+
+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 <https://www.gnu.org/licenses/>.