Update client code to GPL

README.md

@@ -14,6 +14,13 @@ OpenFront is an online real-time strategy game focused on territorial control an
 
 This is a fork/rewrite of WarFront.io. Credit to https://github.com/WarFrontIO.
 
+# OpenFront - Licensing
+
+This project uses a dual-licensing approach:
+
+- Code in the `server/` and `core/` directory is licensed under MIT
+- Client code (in the `client/` directory) is licensed under GPL v3
+
 ## 🌟 Features
 
 - **Real-time Strategy Gameplay**: Expand your territory and engage in strategic battles

src/client/LICENSE-GPL.txt

@@ -0,0 +1,15 @@
+    The client of OpenFront game.
+    Copyright (C) 2025  OpenFront
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.