Add library name and pipeline tag

This PR improves the model card by:

- Adding the relevant `pipeline_tag`, ensuring the model can be found at https://huggingface.co/models?pipeline_tag=image-text-to-text&sort=trending.
- Making sure the "how to use" button appears on the top right (with a Transformers code snippet)

README.md

@@ -1,7 +1,9 @@
 ---
-license: apache-2.0
 base_model:
 - Qwen/Qwen2.5-VL-7B-Instruct
+license: apache-2.0
+library_name: transformers
+pipeline_tag: image-text-to-text
 ---
 
 ## Overview