Update README.md

README.md

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 ```
 
 ## Citation
-```
-
+If you find this project helpful, please use the following to cite it:
+```bibtex
+@misc{zheng2025pptagentgeneratingevaluatingpresentations,
+      title={PPTAgent: Generating and Evaluating Presentations Beyond Text-to-Slides}, 
+      author={Hao Zheng and Xinyan Guan and Hao Kong and Jia Zheng and Hongyu Lin and Yaojie Lu and Ben He and Xianpei Han and Le Sun},
+      year={2025},
+      eprint={2501.03936},
+      archivePrefix={arXiv},
+      primaryClass={cs.AI},
+      url={https://arxiv.org/abs/2501.03936}, 
+}
 ```