Added README file.

README.md

+# Scripts to make plots based on results form high throughput sequencing data
+
+This package contains scripts that are used in [Germano Cecere's
+laboratory](https://www.cecerelab.com/) at Institut Pasteur.
+
+
+## Citing
+
+If you use this package, please cite the following paper:
+
+> Barucci et al, 2020 (doi: [10.1038/s41556-020-0462-7](https://doi.org/10.1038/s41556-020-0462-7))