Add project files.

Program.cs

@@ -0,0 +1,14 @@
+using Voxel;
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        int sizeX = 800;
+        int sizeY = 600;
+        string title = "Game";
+
+        Window window = new Window(sizeX, sizeY, title);
+        window.Run();
+    }
+}