Add pipeline tag and library_name to model card

This PR enhances the model card by adding two important metadata tags: `pipeline_tag: text-generation` and `library_name: transformers`.

- The `pipeline_tag` ensures your model is easily discoverable under the "text-generation" task on the Hugging Face Hub.
- The `library_name` enables the automatic "Use in Transformers" widget on the model page, providing users with a convenient, pre-defined code snippet to start using your model.

These additions will improve the model's visibility and user experience.

README.md

@@ -1,8 +1,11 @@
 ---
-license: apache-2.0
 language:
 - en
+license: apache-2.0
+pipeline_tag: text-generation
+library_name: transformers
 ---
+
 ## Alignment with Fill-In-the-Middle for Enhancing Code Generation
 
 <p align="center">