add arxiv link

README.md

@@ -77,6 +77,7 @@ If you find our work useful in your research, please consider citing:
 @article{longcataudiocodec,
   title={LongCat-Audio-Codec: An Audio Tokenizer and Detokenizer Solution Designed for Speech Large Language Models},
   author={Xiaohan Zhao, Hongyu Xiang, Shengze Ye, Song Li, Zhengkun Tian, Guanyu Chen, Ke Ding, Guanglu Wan},
+  journal={arXiv preprint arXiv:2510.15227},
   organization={LongCat Team, Meituan},
   year={2025}
 }