Update README

README.md

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 # s0-baseline-Qwen1.5-0.5B
 
-[![arxiv](https://img.shields.io/badge/arXiv-2404.05961-b31b1b.svg)](https://arxiv.org/abs/2408.10613)
+[Arxiv](https://arxiv.org/abs/2408.10613) | [Github](https://github.com/tdro-llm/tdro)
+
 
 [tDRO: Task-level Distributionally Robust Optimization for Large Language Model-based Dense Retrieval](https://arxiv.org/abs/2408.10613). Guangyuan Ma, Yongliang Ma, Xing Wu, Zhenpeng Su, Ming Zhou and Songlin Hu.