New command: Add a new user to a Office 365 Group #847

Add a new user to an Office 365 Group

command: o365group user add -u| --userName <userName> -i| --groupId <groupId> -r|--role [role]

• userName: the UPN of the user to add
• groupId: id of the group
• role: Member or Owner. Default Member

feel free to assign to me