Llm-mlx

- New command: `llm mlx import-models`, providing an interface for selecting previously installed Hugging Face `mlx-community` models to register with LLM. Thanks, Ivan [Fioravanti](https://github.com/ivanfioravanti). #5
- Clarify that it is easier to run this on Python 3.12 than Python 3.13 at the moment due to [sentencepiece](https://pypi.org/project/sentencepiece/) currently lacking a Python 3.13 wheel. #7

- Improved documentation.

- Added support for model options, [documented here](https://github.com/simonw/llm-mlx/blob/0.2/README.md#model-options). 4

- Initial plugin release. 1