Step 2: Add a text field to the view controller

- Add an IBOutlet UITextField property to the interface in the implementation file
- Add a UITextField to the top of the view controller in your XIB
- Wire up the UITextField 'referencing outlet' to the 'textField' outlet on the view controller
- Declare the viewcontroller as a UITextFieldDelegate
- Add the textFieldShouldReturn method to the class
- In the method have the textField resign first responder
- In the viewDidLoad method set self as the delegate of the textField

Signed-off-by: Taylor Mott <trm36@humboldt.edu>