MVVM Implementing started

SewerStammGen/HostBuilders/AddConfigurationHostBuilderExtensions.cs

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+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SewerStammGen.HostBuilders
+{
+    static class AddConfigurationHostBuilderExtensions
+    {
+        public static IHostBuilder AddConfiguration(this IHostBuilder hostBuilder)
+        {
+            hostBuilder.ConfigureAppConfiguration(c =>
+            {
+                c.AddJsonFile("appsettings.json");
+                c.AddEnvironmentVariables();
+            }
+            );
+            return hostBuilder;
+        }
+    }
+}