Add initial project structure and configuration files for Marechai.App

Marechai.App/Platforms/Desktop/Program.cs

@@ -0,0 +1,21 @@
+using System;
+using Uno.UI.Hosting;
+
+namespace Marechai.App;
+
+internal class Program
+{
+    [STAThread]
+    public static void Main(string[] args)
+    {
+        var host = UnoPlatformHostBuilder.Create()
+        .App(() => new App())
+        .UseX11()
+        .UseLinuxFrameBuffer()
+        .UseMacOS()
+        .UseWin32()
+        .Build();
+
+        host.Run();
+    }
+}