Update README.md

The HuatuoGPT-Vision model is impressive! We would like to contribute by updating the README to include the base_model information. This will help address the missing details in the model card.

README.md

@@ -6,6 +6,8 @@ language:
 - en
 - zh
 pipeline_tag: text-generation
+base_model:
+- Qwen/Qwen2-7B
 ---
 <div align="center">
 <h1>