DOC: add citation entry to readme and documentation
The source code is now published on HAL, so we can use the citation entry in the documentation.
Prochaines maintenances programmées: lundi 03/06, lundi 01/07, lundi 05/08
Pour plus d'informations: https://doc-si.inria.fr/display/SU/Gitlab
The source code is now published on HAL, so we can use the citation entry in the documentation.