Upload COMPETITION_DESC.md with huggingface_hub

COMPETITION_DESC.md

@@ -15,4 +15,12 @@ The tested algorithms are located in huggingface instance server, which will be
 - Technical Report Due: Sep 20, 2025
 
 ## Citation
-xxx
+If you find our work useful, please kindly cite us via:
+```bibtex
+@article{zhou2024hugsim,
+  title={HUGSIM: A Real-Time, Photo-Realistic and Closed-Loop Simulator for Autonomous Driving},
+  author={Zhou, Hongyu and Lin, Longzhong and Wang, Jiabao and Lu, Yichong and Bai, Dongfeng and Liu, Bingbing and Wang, Yue and Geiger, Andreas and Liao, Yiyi},
+  journal={arXiv preprint arXiv:2412.01718},
+  year={2024}
+}
+```