MVVM Implementing started

SewerStammGen/Interface/Navigator/IMainWindowNavigator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SewerStammGen.Interface.Navigator
+{
+    internal interface IMainWindowNavigator : INavigator
+    {
+    }
+}

SewerStammGen/Interface/Navigator/INavigator.cs

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+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;
+    }
+}