Improve model card with pipeline tag and library name

This PR improves the model card by adding the `pipeline_tag: text-ranking` and `library_name: transformers` to the metadata. The `pipeline_tag` accurately reflects the model's use case, and the `library_name` ensures discoverability for users familiar with the Hugging Face Transformers ecosystem.

README.md

@@ -1,10 +1,13 @@
 ---
-license: mit
-language:
-- en
 base_model:
 - Qwen/Qwen2.5-7B-Instruct
+language:
+- en
+license: mit
+pipeline_tag: text-ranking
+library_name: transformers
 ---
+
 ![image/png](https://cdn-uploads.huggingface.co/production/uploads/654d784d71a30c4bca09a319/Q7MVJfIHDerQ24c1zwZwK.png)
 
 <font size=3><div align='center' >