Added very nice DataGrid control

UserService.Test/UnitTest1.cs

@@ -1,11 +1,9 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Security.Cryptography.X509Certificates;
-using System.Text;
-using System.Threading.Tasks;
 using Microsoft.EntityFrameworkCore;
 using NUnit.Framework;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
 using UserService.DatabaseLayer.DataModels;
 
 namespace UserService.Test
@@ -45,7 +43,6 @@ namespace UserService.Test
             NewMethod(ous, null, 0, ref sb);
             var result = sb.ToString();
             Assert.Pass();
-
         }
 
         private static void NewMethod(IEnumerable<OrganizationUnit> ous, Node parent, int level, ref StringBuilder sb)