Create README.md

## License
Mirror is dual-licensed under:
- **Apache 2.0** for code and development-related use.
- **CC-BY-SA 4.0** for model-generated outputs and non-code artifacts.

This means:
- Developers can use, modify, and distribute **Mirror's code** under **Apache 2.0**.
- Any **text, content, or outputs** generated by Mirror are licensed under **CC-BY-SA 4.0**.
- Users may **choose either license** depending on their needs.

README.md

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+# Mirror Model License
+
+## Option 1: Apache License 2.0
+Mirror is licensed under the Apache License, Version 2.0 (the "License");
+you may not use this model except in compliance with the License.
+You may obtain a copy of the License at:
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+
+## Option 2: Creative Commons Attribution-ShareAlike 4.0 International (CC-BY-SA 4.0)
+This model's outputs (such as generated text) and non-code content are licensed under CC-BY-SA 4.0.
+
+Under this license:
+- You **must give credit** when using or sharing outputs.
+- You **must share modifications under the same license**.
+
+You can find the full license at:
+
+   https://creativecommons.org/licenses/by-sa/4.0/