setup lock pin page

src/App/Models/Page/PinPageModel.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+
+namespace Bit.App.Models.Page
+{
+    public class PinPageModel : INotifyPropertyChanged
+    {
+        private string _labelText;
+        private List<string> _pin;
+
+        public PinPageModel()
+        {
+            LabelText = "_  _  _  _";
+            PIN = new List<string>();
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public string LabelText
+        {
+            get { return _labelText; }
+            set
+            {
+                _labelText = value;
+                PropertyChanged(this, new PropertyChangedEventArgs(nameof(LabelText)));
+            }
+        }
+        public List<string> PIN
+        {
+            get { return _pin; }
+            set
+            {
+                _pin = value;
+                PropertyChanged(this, new PropertyChangedEventArgs(nameof(PIN)));
+            }
+        }
+    }
+}