Update README.md

description of citation

README.md

@@ -309,6 +309,18 @@ If you run into any issues regarding feel free to post your questions or comment
 - [**HF Discussions**](https://huggingface.co/datasets/LeMaterial/LeMat-Bulk/discussions)
 - [**Github Issues**](https://github.com/LeMaterial/lematerial/issues)
 
+## Citation
+We are currently working on a pre-print to describe this dataset but for now the following can be cited:
+```
+@misc {lematerial_2024,
+	author = { {Martin Siron}, {Inel Djafar}, {Lucile Ritchie}, {Etienne Du-Fayet}, {Amandine Rosselo}, {Ali Ramlaoui}, {Leandro von Werra}, {Thomas Wolf}, {Alexandre Duval} },
+	title = { LeMat-BulkUnique Dataset },
+	year = 2024,
+	url = { https://huggingface.co/datasets/LeMaterial/LeMat-BulkUnique },
+	publisher = { Hugging Face }
+}
+```
+
 ## License
 
 This database is licensed by [Creative Commons Attribution 4.0 License](https://creativecommons.org/licenses/by/4.0/).