Add CC BY-NC 4.0 license file with dependency table

LICENSE.md

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+# License
+
+## MMAudio Model Checkpoints — CC BY-NC 4.0
+
+The MMAudio model checkpoints in this repository are licensed under the
+[Creative Commons Attribution-NonCommercial 4.0 International License](https://creativecommons.org/licenses/by-nc/4.0/).
+
+Copyright (c) 2024 Sony Research Inc.
+
+**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.
+- **NonCommercial** — You may not use the material for commercial purposes.
+
+The full license text is available at: https://creativecommons.org/licenses/by-nc/4.0/legalcode
+
+## Dependency Licenses
+
+| Component | License | Source |
+|---|---|---|
+| MMAudio code | MIT | [hkchengrex/MMAudio](https://github.com/hkchengrex/MMAudio) |
+| MMAudio checkpoints | CC BY-NC 4.0 | [hkchengrex/MMAudio](https://huggingface.co/hkchengrex/MMAudio) |
+| BigVGAN | MIT | [nvidia/bigvgan_v2_44khz_128band_512x](https://huggingface.co/nvidia/bigvgan_v2_44khz_128band_512x) |
+| CLIP (DFN5B) | Apple Research License | [apple/DFN5B-CLIP-ViT-H-14-384](https://huggingface.co/apple/DFN5B-CLIP-ViT-H-14-384) |
+| Synchformer | MIT | [hkchengrex/MMAudio](https://huggingface.co/hkchengrex/MMAudio) |