We need to add TheAppsPajamas NuGet package to both our iOS and Droid projects.

You don't need to add it to the core project.

TheAppsPajamas NuGet will run during build and add your assets, but it is a build tool only NuGet package, so will not add any dll's, or unnecessary assets to your completed project - it only builds the assets for the current build configuration.

Right click your iOS project Packages, and choose Add NuGet

Search for TheAppsPajamas

Repeat for Droid

Your projects should now look like this

Xamarin nuget