If you used my previous column as a guide, your Xamarin solution will have a .NET Standard Project with a default XAML file. That's probably as good a start point for creating your "Hello, World" ...
There's no doubt iOS development is hot right now, with all the iPhone 8/iPhone X hoopla, the new iOS 11 recently shipping with cutting-edge features and so on. But there's that pesky Mac thing. Apple ...