Update README.md

Author: Stuyk

README.md

@@ -66,3 +66,32 @@ pnpm install retypeapp --global
 ```
 retype start ./docs
 ```
+
+## License
+
+AGPL-2.0 License with Additional Clause
+
+The Affero General Public License (AGPL) version 2.0, as published by the Free Software Foundation, with the following modification:
+
+### AGPL-2.0 License:
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the Affero General Public License as published by
+    the Free Software Foundation, either version 2 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
+    Affero General Public License for more details.
+
+    You should have received a copy of the Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+### Additional Clause: Commercial Sale of Plugins
+
+    Notwithstanding any other provisions in this license, the use, distribution,
+    and commercial sale of plugins or add-ons designed to interact with or extend
+    the functionality of the software are permitted without restriction. Such plugins
+    or add-ons may be sold, distributed, or used commercially under any license,
+    including proprietary licenses, without requiring the release of source code.