Tests of crack calculator were added

StructureHelperLogics/NdmCalculations/Cracking/RebarStressResult.cs

@@ -8,15 +8,30 @@ using System.Threading.Tasks;
 
 namespace StructureHelperLogics.NdmCalculations.Cracking
 {
+    /// <summary>
+    /// Result of calculation of stress and strain in rebar
+    /// </summary>
     public class RebarStressResult : IResult
     {
         /// <inheritdoc/>
         public bool IsValid { get; set; }
         /// <inheritdoc/>
         public string? Description { get; set; }
+        /// <summary>
+        /// Strain tuple which stress and strain is obtained for
+        /// </summary>
         public StrainTuple StrainTuple { get; set; } 
+        /// <summary>
+        /// Stress in rebar, Pa
+        /// </summary>
         public double RebarStress { get; set; }
+        /// <summary>
+        /// Strain in rebar, dimensionless
+        /// </summary>
         public double RebarStrain { get; set; }
+        /// <summary>
+        /// Strain in fake concrete ndm-part which rounds rebas and locatade at axis of rebar (refrence strain in concrete)
+        /// </summary>
         public double ConcreteStrain { get; set; }
     }
 }