Release notes for Legato 21.05.0
Release notes for Legato 21.05.0

Resolves: LE-16084
Change-Id: I5a6e046888f3cfff972081e3488cfe1385be6408

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af