MVVM Implementing started

SewerStammGen/ViewModel/MainWindowViewModel.cs

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+using SewerStammGen.Interface.Navigator;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SewerStammGen.ViewModel
+{
+    internal class MainWindowViewModel : BaseViewModel
+    {
+        public IMainWindowNavigator Navigator { get; set; }
+        public BaseViewModel CurrentView => Navigator.CurrentViewModel;
+
+        public MainWindowViewModel(IMainWindowNavigator navigator)
+        {
+            Navigator = navigator;
+        }
+    }
+}