Update README.md

README.md

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----
-license: apache-2.0
----
+---
+license: apache-2.0
+---
+
+# Cite
+@article{lin2024pixwizard,
+  title={Pixwizard: Versatile image-to-image visual assistant with open-language instructions},
+  author={Lin, Weifeng and Wei, Xinyu and Zhang, Renrui and Zhuo, Le and Zhao, Shitian and Huang, Siyuan and Teng, Huan and Xie, Junlin and Qiao, Yu and Gao, Peng and others},
+  journal={arXiv preprint arXiv:2409.15278},
+  year={2024}
+}