Tests of crack calculator were added

StructureHelperCommon/Models/Shapes/IPointShape.cs

@@ -1,7 +1,13 @@
 namespace StructureHelperCommon.Models.Shapes
 {
+    /// <summary>
+    /// Geomentry primitive of point
+    /// </summary>
     public interface IPointShape : IShape
     {
+        /// <summary>
+        /// Area of point
+        /// </summary>
         double Area { get; set; }
     }
 }