Force crack calculator was fixed

StructureHelperLogics/NdmCalculations/Cracking/ICrackWidthTupleResult.cs

@@ -1,12 +1,23 @@
-namespace StructureHelperLogics.NdmCalculations.Cracking
+using StructureHelperCommon.Models.Forces;
+
+namespace StructureHelperLogics.NdmCalculations.Cracking
 {
+    /// <summary>
+    /// 
+    /// </summary>
     public interface ICrackWidthTupleResult
     {
         /// <summary>
-        /// Calculated crack width
+        /// Calculated crack width, m
         /// </summary>
         double CrackWidth { get; set; }
+        /// <summary>
+        /// True if actual crack width less than limit one
+        /// </summary>
         bool IsCrackLessThanUltimate { get; }
+        /// <summary>
+        /// Limit crack width, m
+        /// </summary>
         double UltimateCrackWidth { get; set; }
     }
 }