Step 4: Add a clear button to the view controller

- Add a IBOutlet UIButton property to the interface in the implementation file
- Add a UIButton just to the right of the title field above the text view in the view controller in your XIB
- Wire up the UIButton 'referencing outlet' to the 'button' outlet on the view controller
- Add an IBAction method called clear to your implementation file
- Wire up the UIButton 'TouchUpInside' control event to your action
- In the action set the title field and text view's content to empty strings

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