Add beam shear classes

StructureHelperLogics/Models/BeamShears/IStirrupByRebar.cs

@@ -0,0 +1,17 @@
+using StructureHelperLogics.Models.Materials;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.Models.BeamShears
+{
+    public interface IStirrupByRebar : IStirrup
+    {
+        IReinforcementLibMaterial ReinforcementMaterial { get; set; }
+        double LegCount { get; set; }
+        double Diameter { get; set; }
+        double Step { get; set; }
+    }
+}