[CoreData] add Entity 'Beverage' with Attributes 'title' and 'detail' (p.226-233)
[CoreData] create 'Beverage' manager object (p.234-236)

New File > iOS > Core Data > NSManagerObject subclass
[Add View][UI] add text field 'title', 'detail', and button 'add' (p.246-247)

connect UI components to AddViewController by 'IBOutlet' and 'IBAction'
[Add View] support App Delegate in AddViewController (p.248-249)
[Add View] hide the keyboard when user press 'return' button (p.252-255)

1. connect UITextField delegate in .xib
2. implement method 'textFieldShouldReturn:'