Update README.md

ma-xu · Feb 16, 2022 · ceb37f8 · ceb37f8
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     <a><img src="images/columbia.png"  height="70px" ></a>
 </div>
 
-[Project Sites]() | [arXiv]() | Primary contact: [Xu Ma](mailto:ma.xu1@northeastern.edu)
+[Project Sites]() | [arXiv](https://arxiv.org/abs/2202.07123) | Primary contact: [Xu Ma](mailto:ma.xu1@northeastern.edu)
 
 <div align="center">
   <img src="images/overview.png" width="650px" height="300px">