Add extended force tuple result

StructureHelperCommon/Models/States/StateCalcTermPair.cs

@@ -0,0 +1,13 @@
+using StructureHelperCommon.Infrastructures.Enums;
+
+namespace StructureHelperCommon.Models.States
+{
+    /// <inheritdoc/>
+    public class StateCalcTermPair : IStateCalcTermPair
+    {
+        /// <inheritdoc/>
+        public LimitStates LimitState { get; set; }
+        /// <inheritdoc/>
+        public CalcTerms CalcTerm { get; set; }
+    }
+}