Add initial project structure and configuration files for Marechai.App

Marechai.App/Platforms/WebAssembly/Program.cs

@@ -0,0 +1,17 @@
+using System.Threading.Tasks;
+using Uno.UI.Hosting;
+
+namespace Marechai.App;
+
+public class Program
+{
+    public static async Task Main(string[] args)
+    {
+        var host = UnoPlatformHostBuilder.Create()
+        .App(() => new App())
+        .UseWebAssembly()
+        .Build();
+
+        await host.RunAsync();
+    }
+}