update readme

Author: wangxiaomeng030

README.md

@@ -8,8 +8,7 @@
 
 <div align="left">
 <div align="left">
-
-[![Lint](https://github.com/openxrlab/xrdslam/actions/workflows/lint.yml/badge.svg)](https://github.com/openxrlab/xrdslam/actions/workflows/lint.yml) [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://github.com/openxrlab/xrdslam/blob/master/LICENSE)
+[![Lint](https://github.com/openxrlab/xrdslam/actions/workflows/lint.yml/badge.svg)](https://github.com/openxrlab/xrdslam/actions/workflows/lint.yml) [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://github.com/openxrlab/xrdslam/blob/master/LICENSE) [![arXiv](https://img.shields.io/badge/arXiv-1234.56789-b31b1b.svg)](https://arxiv.org/abs/2410.23690)
 
 </div>