Correct pipeline tag and add library name

This PR corrects the `pipeline_tag` from `text-generation` to the more appropriate `feature-extraction`, reflecting the model's use in information retrieval. It also adds `library_name: transformers` to the metadata, clarifying the model's compatibility with the Transformers library.

README.md

@@ -1,15 +1,16 @@
 ---
-license: mit
-datasets:
-- jhu-clsp/rank1-training-data
 base_model:
 - Qwen/Qwen2.5-7B
-pipeline_tag: text-generation
+datasets:
+- jhu-clsp/rank1-training-data
+language:
+- en
+license: mit
+pipeline_tag: feature-extraction
 tags:
 - reranker
 - retrieval
-language:
-- en
+library_name: transformers
 ---
 
 # rank1-7b: Test-Time Compute for Reranking in Information Retrieval