Add GPL-3.0 license and improve third-party attribution

- Add LICENSE file with GPL-3.0 license text and copyright notice
- Update README.md with dedicated Third-Party Components section
- Clarify licensing for ComfyUI (GPL-3.0), PyTorch (BSD 3-Clause), and ROCm (Various OSS)

LICENSE

@@ -0,0 +1,20 @@
+GNU GENERAL PUBLIC LICENSE
+Version 3, 29 June 2007
+
+This project is licensed under the GNU General Public License v3.0.
+The full license text can be found at: https://www.gnu.org/licenses/gpl-3.0.txt
+
+Copyright (C) 2025 ComfyUI-ROCm Project
+
+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/>.

README.md

@@ -170,7 +170,12 @@ Run with: `docker compose up -d`
 
 ## 📄 License & Credits
 
-This Docker image packages ComfyUI with ROCm support. ComfyUI is licensed under GPL-3.0.
+This project is licensed under GPL-3.0. See the [LICENSE](LICENSE) file for details.
+
+### Third-Party Components
+- **ComfyUI**: GPL-3.0 - [ComfyUI](https://github.com/comfyanonymous/ComfyUI)
+- **PyTorch**: BSD 3-Clause - [PyTorch](https://pytorch.org/)
+- **ROCm**: Various OSS licenses - [AMD ROCm](https://rocm.docs.amd.com/)
 
 **Acknowledgments:**
 - [ComfyUI](https://github.com/comfyanonymous/ComfyUI) - Node-based AI workflow interface