Added MauiAppBuilder extension for the ShellNavigator#303

AndreasReitberger merged 1 commit intomainAndreasReitberger/SharedMauiCoreLibrary:mainfrom

302-add-mauiappbuilder-extension-for-the-shellnavigatorAndreasReitberger/SharedMauiCoreLibrary:302-add-mauiappbuilder-extension-for-the-shellnavigatorCopy head branch name to clipboard