This PR improves the model card by adding the `library_name` and `pipeline_tag` metadata. The `library_name` is set to `transformers` based on the provided usage example. The `pipeline_tag` is set to `question-answering` as per the paper abstract and prompt. Additionally, the content from the Github README has been incorporated to provide more comprehensive information about the model, data, training, and evaluation.
Merge branch 'main' of hf.co:UCSC-VLAA/MedReason-Mistral
