Update README.md

README.md

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-license: cc-by-nc-4.0
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+## License
+This dataset is licensed under the **Creative Commons Attribution-NonCommercial 4.0 (CC BY-NC 4.0)** license.
+
+You are free to:
+- Share: Copy and redistribute the material in any medium or format.
+- Adapt: Remix, transform, and build upon the material.
+
+Under the following terms:
+- **Attribution**: You must give appropriate credit, provide a link to the license, and indicate if changes were made.
+- **Non-Commercial**: You may not use the material for commercial purposes.
+
+For more details, see [CC BY-NC 4.0](https://creativecommons.org/licenses/by-nc/4.0/).