Update README.md

README.md

@@ -9,10 +9,12 @@ app_file: app.py
 pinned: false
 license: mit
 ---
-
+### Citation
+```
 @article{zhang2023controlvideo,
   title={ControlVideo: Training-free Controllable Text-to-Video Generation},
   author={Zhang, Yabo and Wei, Yuxiang and Jiang, Dongsheng and Zhang, Xiaopeng and Zuo, Wangmeng and Tian, Qi},
   journal={arXiv preprint arXiv:2305.13077},
   year={2023}
 }
+```