Add primitive visual property

StructureHelperLogics/Models/BeamShears/IHasStartEndCoordinate.cs

@@ -0,0 +1,14 @@
+namespace StructureHelperLogics.Models.BeamShears
+{
+    public interface IHasStartEndCoordinate
+    {
+        /// <summary>
+        /// Coordinate of start of zone of stirrups
+        /// </summary>
+        double StartCoordinate { get; set; }
+        /// <summary>
+        /// Coordinate of end of zone of stirrups
+        /// </summary>
+        double EndCoordinate { get; set; }
+    }
+}