This PR enhances the model card by:
- Adding `library_name: transformers` to ensure the "how to use" widget appears automatically.
- Adding `pipeline_tag: question-answering` for better discoverability on the Hugging Face Hub.
- Updating the license to `apache-2.0` as specified in the GitHub repository.
- Adding a link to the GitHub repository.
- Updating the `model_id` in the usage example to `LinjieMu/MedCEG`.
Please review and merge if these improvements are satisfactory!
