Adds a navigation node

• command: spo navigation node add -u|--webUrl <webUrl> -l|--location <location> -t|--title <title> --url <url> --isExternal
• webUrl: Absolute URL of the site to which navigation should be modified
• location: Navigation type where the node should be added. Available options: QuickLaunch|TopNavigationBar
• title: Navigation node title
• url: Navigation node URL
• isExternal: Set, if the navigation node points to an external URL

For more information see the Add-PnPNavigationNode cmdlet