Add pertpy citation

README.md

@@ -36,6 +36,11 @@ If you want to use the differential gene expression interface, please install pe
 pip install pertpy[de]
 ```
 
+## Citation
+
+[Lukas Heumos, Yuge Ji, Lilly May, Tessa Green, Xinyue Zhang, Xichen Wu, Johannes Ostner, Stefan Peidli, Antonia Schumacher, Karin Hrovatin, Michaela Mueller, Faye Chong, Gregor Sturm, Alejandro Tejada, Emma Dann, Mingze Dong, Mojtaba Bahrami, Ilan Gold, Sergei Rybakov, Altana Namsaraeva, Amir Ali Moinfar, Zihe Zheng, Eljas Roellin, Isra Mekki, Chris Sander, Mohammad Lotfollahi, Herbert B. Schiller, Fabian J. Theis
+bioRxiv 2024.08.04.606516; doi: https://doi.org/10.1101/2024.08.04.606516](https://www.biorxiv.org/content/10.1101/2024.08.04.606516v1)
+
 [pip]: https://pip.pypa.io/
 [pypi]: https://pypi.org/
 [usage]: https://pertpy.readthedocs.io/en/latest/usage/usage.html