Tests of crack calculator were added

StructureHelperLogics/NdmCalculations/Cracking/CrackForceResult.cs

@@ -9,19 +9,54 @@ using System.Threading.Tasks;
 
 namespace StructureHelperLogics.NdmCalculations.Cracking
 {
+    /// <summary>
+    /// Result of crack calculation
+    /// </summary>
     public class CrackForceResult : IResult
     {
+        /// <inheritdoc/>
         public bool IsValid { get; set; }
+        /// <inheritdoc/>
         public string Description { get; set; }
+        /// <summary>
+        /// True when section is cracked
+        /// </summary>
         public bool IsSectionCracked { get; set; }
+        /// <summary>
+        /// Factor of load beetwen start tuple and end tuple when cracks are appeared
+        /// </summary>
         public double FactorOfCrackAppearance { get; set; }
+        /// <summary>
+        /// Start force tuple of range where force of cracking is looking for
+        /// </summary>
         public IForceTuple StartTuple { get; set; }
+        /// <summary>
+        /// End force tuple of range where force of cracking is looking for
+        /// </summary>
         public IForceTuple EndTuple { get; set; }
+        /// <summary>
+        /// Force tuple which correspondent to first crack appearence
+        /// </summary>
         public IForceTuple TupleOfCrackAppearance { get; set; }
+        /// <summary>
+        /// General curvature in cracked section
+        /// </summary>
         public StrainTuple CrackedStrainTuple { get; set; }
+        /// <summary>
+        /// Average general curvature with considering of cracking
+        /// </summary>
         public StrainTuple ReducedStrainTuple { get; set; }
+        /// <summary>
+        /// Factor of softening of stifness with considering of cracks
+        /// </summary>
         public StrainTuple SofteningFactors { get; set; }
+        /// <summary>
+        /// Collection of ndms which crack properties looking for
+        /// </summary>
         public IEnumerable<INdm> NdmCollection { get; set; }
+        /// <summary>
+        /// Common softening factor
+        /// </summary>
         public double PsiS { get; set; }
         
     }