SourceToTargetViewModel was added

Windows/ViewModels/Calculations/Calculators/ICombinationSourceToTargetViewModel.cs

@@ -0,0 +1,13 @@
+using StructureHelperCommon.Models.Forces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelper.Windows.ViewModels.Calculations.Calculators
+{
+    public interface ICombinationSourceToTargetViewModel : ISourceToTargetViewModel<IForceCombinationList>
+    {
+    }
+}