MVVM Implementing started

SewerStammGen/Interface/Navigator/INavigator.cs

@@ -0,0 +1,19 @@
+using SewerStammGen.ViewModel;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SewerStammGen.Interface.Navigator
+{
+    internal interface INavigator
+    {
+        BaseViewModel CurrentViewModel
+        {
+            get;
+            set;
+        }
+        event Action StateChanged;
+    }
+}