Update README.md

add preprint info

README.md

@@ -422,6 +422,8 @@ Disclaimer: it is made up of Alexandria, Materials Project and OQMD materials, w
 
 ## Citation Information
 
+We are currently in the process of creating a pre-print to describe our methods, the materials fingerprint method and the dataset. For now however 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} },