notify agents for rdv created starting soon
Created by: adipasquale
cf https://trello.com/c/dseR7A0F/844-agentagenda-alerte-mails-des-rdv-cr%C3%A9%C3%A9s-au-dernier-moment
Created by: adipasquale
cf https://trello.com/c/dseR7A0F/844-agentagenda-alerte-mails-des-rdv-cr%C3%A9%C3%A9s-au-dernier-moment