Create README.md

The model is fine-tuned from openai's ViT-L-14 using PMC_OA _ beta and roco's data sets, using the tool open_clip（https://github.com/mlfoundations/open_clip）.

README.md

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+---
+datasets:
+- axiong/pmc_oa_beta
+language:
+- en
+library_name: open_clip
+pipeline_tag: text-to-image
+tags:
+- biology
+- chemistry
+- medical
+---