include citation (#6063)

Add citation URL to README.

Signed-off-by: Richard Brown <[email protected]>
Co-authored-by: Eric Kerfoot <[email protected]>

Author: rijobro

README.md

@@ -51,6 +51,10 @@ Examples and notebook tutorials are located at [Project-MONAI/tutorials](https:/
 
 Technical documentation is available at [docs.monai.io](https://docs.monai.io).
 
+## Citation
+
+If you have used MONAI in your research, please cite us! The citation can be exported from: https://arxiv.org/abs/2211.02701.
+
 ## Model Zoo
 [The MONAI Model Zoo](https://github.com/Project-MONAI/model-zoo) is a place for researchers and data scientists to share the latest and great models from the community.
 Utilizing [the MONAI Bundle format](https://docs.monai.io/en/latest/bundle_intro.html) makes it easy to [get started](https://github.com/Project-MONAI/tutorials/tree/main/model_zoo) building workflows with MONAI.