Bug 581892: [Sirius][PackageDiagram] Add Package diagram documentation - User doc - Dev doc Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=581892 Change-Id: I25f74d9059a2899448bf06057d2f9782eed8bf96 Signed-off-by: Glenn Plouhinec <glenn.plouhinec@obeo.fr>