Update README.md

README.md

 
 The dataset (metadata + mask annotations) is hosted at:  
 👉 [Download via Zenodo](https://zenodo.org/...) *(or your link)*
+This project uses the DeepLesion dataset, publicly available from the NIH Clinical Center.
+Please note that this dataset is not released under Apache 2.0. Users must ensure compliance with NIH terms of use: https://nihcc.app.box.com/v/DeepLesion
 
 ## 🚀 Getting Started
 
 cd 3DLAND
 pip install -r requirements.txt
 
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+📜 License
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+Code in this repository is licensed under Apache License 2.0.
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