MVVM Implementing started

SewerStammGen/Interface/IViewModelAbstractFactory.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
+{
+    public interface IViewModelAbstractFactory
+    {
+        BaseViewModel CreateViewModel(EMainWindowViewType viewType);
+    }
+}