Add README.md: license and attribution

README.md

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+---
+license: mit
+library_name: libreyolo
+tags:
+  - object-detection
+  - yolov9
+---
+
+# LibreYOLO9t
+
+YOLOv9-T weights converted from
+[MultimediaTechLab/YOLO](https://github.com/MultimediaTechLab/YOLO)
+(release v1.0-alpha, file `v9-t.pt`) to the LibreYOLO format.
+
+## Source
+
+Copyright (c) 2024 Kin-Yiu Wong and Hao-Tang Tsui. Licensed under the MIT
+License.
+
+## Modifications
+
+State-dict key remapping only. See `weights/convert_yolo9_weights.py` in
+the [LibreYOLO source repository](https://github.com/LibreYOLO/libreyolo).
+Learned parameters are unchanged.
+
+## License
+
+MIT License. See the [`LICENSE`](./LICENSE) file in this repository.