MVVM Implementing started

SewerStammGen/HostBuilders/AddServicesHostBuilderExtensions.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using SewerStammGen.Interface.Navigator;
+using SewerStammGen.ViewModel.State.Navigation;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SewerStammGen.HostBuilders
+{
+    internal static class AddServicesHostBuilderExtensions
+    {
+        public static IHostBuilder AddServices(this IHostBuilder host)
+        {
+            host.ConfigureServices(services =>
+            {
+                services.AddSingleton<IMainWindowNavigator, MainWindowNavigator>();
+            });
+            return host;
+        }
+    }
+}