New command: Create a group setting #443

Creates a group setting

• command: graph groupsetting add -i|--templateId <templateId> ...
• id: The ID of the group setting template to use to create the group setting
• ... this command supports arbitrary options which are used as values for the template properties

For more information see the groupsetting_post_groupsettings MS Graph APIs.

This commands makes it possible to configure modern SharePoint sites classification https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/modern-experience-site-classification