add authentication method selection UI

pass/TextFieldTableViewCell.swift

@@ -0,0 +1,30 @@
+//
+//  TextFieldTableViewCell.swift
+//  pass
+//
+//  Created by Mingshen Sun on 25/1/2017.
+//  Copyright © 2017 Bob Sun. All rights reserved.
+//
+
+import UIKit
+import Former
+
+class TextFieldTableViewCell: UITableViewCell, TextFieldFormableRow {
+    @IBOutlet weak var titleLabel: UILabel!
+    @IBOutlet weak var textField: UITextField!
+
+    override func awakeFromNib() {
+        super.awakeFromNib()
+    }
+
+    func formTextField() -> UITextField {
+        return textField
+    }
+    
+    func formTitleLabel() -> UILabel? {
+        return titleLabel
+    }
+    
+    func updateWithRowFormer(_ rowFormer: RowFormer) {}
+    
+}