Add metadata

This PR ensures a "Use this model" button appears at the top right with a sample code snippet.

README.md

@@ -6,6 +6,8 @@ language:
 - en
 base_model:
 - Qwen/Qwen2-VL-7B-Instruct
+library_name: transformers
+pipeline_tag: image-text-to-text
 ---
 
 # MonetGPT: Solving Puzzles Enhances MLLMs' Image Retouching Skills