Add mail section to the README
I think it can be interesting for newcomers to have directly the info instead of searching it on https://doc-si.inria.fr/display/SU/Messagerie+collaborative+ZIMBRA#expand-Configurationdesonagenda
[A venir] Mise en place de quotas sur nos instances GitLab. Plus d'information sur : https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
[Coming soon] Quotas installation on our GitLab instances. More information: https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
I think it can be interesting for newcomers to have directly the info instead of searching it on https://doc-si.inria.fr/display/SU/Messagerie+collaborative+ZIMBRA#expand-Configurationdesonagenda