moved to logic from api to lib

Models/SoilPropertyType.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace FarmMapsAPI.Carbon.Models
+{
+    public class SoilPropertyType
+    {
+        public double OM_Cont { get; set; }
+        public double OM_Corr { get; set; }
+        public double Bulk_Density { get; set; }
+        public double Clay_Content { get; set; }
+        public double Depth { get; set; }
+    }
+
+    struct SoilTypePropertyKey
+    {
+        public string SoilType { get; set; }
+        public string SoilProperty{ get; set; }
+
+        public override int GetHashCode()
+        {
+            return SoilType.GetHashCode() ^ SoilProperty.GetHashCode();
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj is SoilTypePropertyKey)
+            {
+                SoilTypePropertyKey compositeKey = (SoilTypePropertyKey)obj;
+
+                return ((this.SoilType == compositeKey.SoilType) &&
+                        (this.SoilProperty == compositeKey.SoilProperty));
+            }
+
+            return false;
+        }
+    }
+}