Add README.md: license and attribution

README.md

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+---
+license: apache-2.0
+library_name: libreyolo
+tags:
+  - object-detection
+  - yolox
+---
+
+# LibreYOLOXx
+
+Pretrained YOLOX-X weights repackaged for the
+[LibreYOLO](https://github.com/LibreYOLO/libreyolo) framework.
+
+## Source
+
+Derived from [Megvii-BaseDetection/YOLOX](https://github.com/Megvii-BaseDetection/YOLOX).
+
+Copyright (c) 2021-2022 Megvii Inc. All rights reserved.
+Licensed under the Apache License, Version 2.0.
+
+## Modifications
+
+No learned parameters were modified. The only change is state-dict key
+remapping so that upstream checkpoints load into LibreYOLO's module
+naming scheme.
+
+## License
+
+Apache License 2.0. See the [`LICENSE`](./LICENSE) and [`NOTICE`](./NOTICE)
+files in this repository.