Splash screen for mac project in visual studio.

Question

I add to my standard solution from Windows(UWP, iOS, and Android) a MacOS(Cocoa app) project. After I add images for a standard splash for UWP and iOS and I create as well a splash screen for the Android project. But I can't find any information on how to create a splash screen for Mac project.

How to create one?

P.S. Sorry is category it's wrong , I can't find Xamarin.Forms or even Xamarin.