Update README.md

README.md

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 ---
 license: apache-2.0
 ---
+Please kindly cite our paper if you use our code, data, models or results:
+
+```bibtex
+@article{ku2023imagenhub,
+  title={ImagenHub: Standardizing the evaluation of conditional image generation models},
+  author={Max Ku, Tianle Li, Kai Zhang, Yujie Lu, Xingyu Fu, Wenwen Zhuang, Wenhu Chen},
+  journal={arXiv preprint arXiv:2310.01596},
+  year={2023}
+}
+```