address book by mvvm pattern

PacticeSolution/AddressBook_MVVMSample/ViewModel/AddViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AddressBook_MVVMSample.ViewModel
+{
+    internal class AddViewModel
+    {
+    }
+}