added citation

README.md

@@ -35,4 +35,12 @@ the European Space Agency and European Commission's joint Sentinel-1 and Sentine
   train_agbm      |    8689  |   2.1GB
 ```
 
-## Citation : under review
+## Citation:
+```
+@inproceedings{nascetti2023biomassters,
+  title={BioMassters: A Benchmark Dataset for Forest Biomass Estimation using Multi-modal Satellite Time-series},
+  author={Nascetti, Andrea and Yadav, Ritu and Brodt, Kirill and Qu, Qixun and Fan, Hongwei and Shendryk, Yuri and Shah, Isha and Chung, Christine},
+  booktitle={Thirty-seventh Conference on Neural Information Processing Systems Datasets and Benchmarks Track},
+  year={2023}
+}
+```