Soil anchor was added

StructureHelperCommon/Models/Soils/IAnchorSoilProperties.cs

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+using StructureHelperCommon.Infrastructures.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Models.Soils
+{
+    public enum SoilType
+    {
+        SandAndSemiSand,
+        SemiClay,
+        Clay
+    }
+    /// <summary>
+    /// Properties of soil for calculating of soil anchor
+    /// </summary>
+    public interface IAnchorSoilProperties : ISaveable
+    {
+        /// <summary>
+        /// Young's modulus, Pa
+        /// </summary>
+        double YoungsModulus { get; set; }
+        /// <summary>
+        /// Poison ratio
+        /// </summary>
+        double PoissonRatio { get; set; }
+        /// <summary>
+        /// Volumetric weight, N/m^3
+        /// </summary>
+        double VolumetricWeight { get; set; }
+        /// <summary>
+        /// Angle of internal friction, degree
+        /// </summary>
+        double FrictionAngle { get; set; }
+        /// <summary>
+        /// Coheasion, Pa
+        /// </summary>
+        double Coheasion { get; set; }
+        /// <summary>
+        /// Type of Soil
+        /// </summary>
+        SoilType SoilType { get; set; }
+    }
+}