Add Program and Game class

30_Cube/csharp/Game.cs

@@ -0,0 +1,18 @@
+namespace Cube;
+
+internal class Game
+{
+    private readonly IReadWrite _io;
+    private readonly IRandom _random;
+
+    public Game(IReadWrite io, IRandom random)
+    {
+        _io = io;
+        _random = random;
+    }
+
+    public void Play()
+    {
+        _io.Write(Streams.Introduction);
+    }
+}