MVVM Implementing started

SewerStammGen/HostBuilders/AddViewModelsHostBuilderExtensions.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using SewerStammGen.ViewModel;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SewerStammGen.HostBuilders
+{
+    static class AddViewModelsHostBuilderExtensions
+    {
+        public static IHostBuilder AddViewModels(this IHostBuilder hostBuilder)
+        {
+            hostBuilder.ConfigureServices(services =>
+            {
+                services.AddTransient<MainWindowViewModel>();
+            });
+
+            return hostBuilder;
+        }
+    }
+}