Add library name and pipeline tag

This PR adds the library_name, which ensures the correct 'how to use' button appears on the top right, and also adds the pipeline_tag,
so that this model shows up on the text-generation page at https://huggingface.co/models?pipeline_tag=text-generation.

README.md

@@ -10,6 +10,8 @@ tags:
 - cft
 - math
 - reasoning
+pipeline_tag: text-generation
+library_name: transformers
 ---
 
 # Qwen2.5-32B-Instruct-CFT