Adding the iOS-specific class

Let's start by creating the class for Game on iOS, as follows:

1. In the WhackABox.iOS project root, add a new file called Game.cs.
2. Add the code to the class, as shown in the following snippet:

using Urho;

namespace WhackABox.iOS
{
    public class Game : WhackABox.Game
    {
        public Game(ApplicationOptions options) : base(options)
        {
        }
    }
}

Since the abstract base class requires a constructor to be called, we need to extend that constructor into our platform-specific class. Now, let's do the same thing for Android.