add document for developers
add document for developers

These are the rules that we agreed upon on the last meeting CNES/CMLA
(february 2 and 3, 2017)

MISS3D/s2p,dyoussef/s2p,jmichel-otb/s2p,carlodef/s2p,mnhrdt/s2p,MISS3D/s2p,jmichel-otb/s2p,dyoussef/s2p,MISS3D/s2p,mnhrdt/s2p,jmichel-otb/s2p,dyoussef/s2p,carlodef/s2p,dyoussef/s2p,MISS3D/s2p,jmichel-otb/s2p