Ported libs fo net V6

HaDocumentV6/Comparers/DefaultComparer.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using HaDocument.Models;
+
+namespace HaDocument.Comparers
+{
+    public class DefaultComparer : IComparer<Meta>
+    {
+        public int Compare(Meta first, Meta second)
+        {
+            if (first.Sort != second.Sort)
+                return System.DateTime.Compare(first.Sort, second.Sort);
+            else if (first.Order != second.Order)
+                return first.Order.CompareTo(second.Order);
+            else
+                return String.Compare(first.Index, second.Index);
+        }
+    }
+}