doc: add citation to README

README.md

@@ -3,6 +3,14 @@
 
 # HiCool
 
+*Please cite:* 
+
+Serizay J, Matthey-Doret C, Bignaud A, Baudry L, Koszul R (2024). “Orchestrating chromosome conformation capture analysis with Bioconductor.” _Nature Communications_, **15**, 1-9. [doi:10.1038/s41467-024-44761-x](https://doi.org/10.1038/s41467-024-44761-x).
+
+[![DOI](https://img.shields.io/badge/Nat._Commun-10.1038/s41467--024--44761--x-blue)](https://www.nature.com/articles/s41467-024-44761-x)
+
+--- 
+
 The `HiCool` R/Bioconductor package provides an **end-to-end interface** to 
 process and normalize Hi-C paired-end fastq reads into `.(m)cool` files.