Add game intro

67_One_Check/csharp/Game.cs

@@ -0,0 +1,20 @@
+namespace OneCheck;
+
+internal class Game
+{
+    private readonly IReadWrite _io;
+    private readonly Board _board;
+
+    public Game(IReadWrite io)
+    {
+        _io = io;
+        _board = new Board();
+    }
+
+    public void Play()
+    {
+        _io.Write(Streams.Introduction);
+        
+        _io.WriteLine(_board);
+    }
+}