Update pipeline tag, add library name, link to paper

This PR improves the model card by adding the appropriate `pipeline_tag`, as well as the `library_name`. It also updates the link to the paper to
the Hugging Face paper page.

README.md

@@ -5,7 +5,8 @@ language:
 - zh
 tags:
 - reward model
-pipeline_tag: visual-question-answering
+pipeline_tag: any-to-any
+library_name: transformers
 ---
 
 <p align="center">