Update index.md

Author: sarthakpati

docs/index.md

@@ -26,6 +26,25 @@ The **G**ener**a**lly **N**uanced **D**eep **L**earning **F**ramework (GaNDLF) f
 - [FAQ](./faq.md)
 - [Acknowledgements](./acknowledgements.md)
 
+## Citation
+Please cite the following article for GaNDLF ([full paper](https://www.nature.com/articles/s44172-023-00066-3)):
+
+```bib
+@article{pati2023gandlf,
+    author={Pati, Sarthak and Thakur, Siddhesh P. and Hamamc{\i}, {\.{I}}brahim Ethem and Baid, Ujjwal and Baheti, Bhakti and Bhalerao, Megh and G{\"u}ley, Orhun and Mouchtaris, Sofia and Lang, David and Thermos, Spyridon and Gotkowski, Karol and Gonz{\'a}lez, Camila and Grenko, Caleb and Getka, Alexander and Edwards, Brandon and Sheller, Micah and Wu, Junwen and Karkada, Deepthi and Panchumarthy, Ravi and Ahluwalia, Vinayak and Zou, Chunrui and Bashyam, Vishnu and Li, Yuemeng and Haghighi, Babak and Chitalia, Rhea and Abousamra, Shahira and Kurc, Tahsin M. and Gastounioti, Aimilia and Er, Sezgin and Bergman, Mark and Saltz, Joel H. and Fan, Yong and Shah, Prashant and Mukhopadhyay, Anirban and Tsaftaris, Sotirios A. and Menze, Bjoern and Davatzikos, Christos and Kontos, Despina and Karargyris, Alexandros and Umeton, Renato and Mattson, Peter and Bakas, Spyridon},
+    title={GaNDLF: the generally nuanced deep learning framework for scalable end-to-end clinical workflows},
+    journal={Communications Engineering},
+    year={2023},
+    month={May},
+    day={16},
+    volume={2},
+    number={1},
+    pages={23},
+    issn={2731-3395},
+    doi={10.1038/s44172-023-00066-3},
+    url={https://doi.org/10.1038/s44172-023-00066-3}
+}
+```
 
 ## Contact
 GaNDLF developers can be reached via the following ways: