Add pipeline tag, library name and Github repo link

This PR adds the relevant metadata tags, and adds a link to the Github repository:

- library_name: transformers
- pipeline_tag: text-generation

This ensures the model can be found at https://huggingface.co/models?pipeline_tag=text-generation and that the "how to use" button is shown.

README.md

@@ -1,5 +1,7 @@
 ---
 license: apache-2.0
+library_name: transformers
+pipeline_tag: text-generation
 ---
 
 ## Exploring the Inquiry-Diagnosis Relationship with Advanced Patient Simulators
@@ -7,4 +9,6 @@ license: apache-2.0
 
 ## 🔥 Release News
 - `[2025/1/23]` Release [weights](https://huggingface.co/zhaocheng/patient_simulator).
-- `[2025/1/16]` Release [paper](https://arxiv.org/abs/2501.09484).
+- `[2025/1/16]` Release [paper](https://arxiv.org/abs/2501.09484).
+
+Github repository: https://github.com/LIO-H-ZEN/PatientSimulator