update README.md.

Signed-off-by: 葛峻恺 <202115006@mail.sdu.edu.cn>

README.md

@@ -168,6 +168,14 @@ If you use this code in your research, please cite:
 }
 
 
+## 🧾 License
+
+This project is licensed under the [GNU General Public License v3](https://www.gnu.org/licenses/gpl-3.0.html) for open-source academic use.
+
+If you wish to use this software for commercial purposes and cannot comply with the GPL v3, a separate **Commercial License** is available.  
+Please contact us at [sunhuaifeng@email.sdu.edu.cn] for further details.
+
+
 ### 📫 Contact
 
 If you have questions, reach out to: