remove the “Hello World!” label
add a text-field in main.storyboard and set it Placeholder
use Auto Layout for text_field
add Table View Controller before View Controller
set the Table View Controller as Initial View Controller
add Static Cells in Table View Controller
add Navigation Controller in Table View Controller
add Bar Button Item (Add) in Navigation Item
add push Action Segue to View Controller and update Constranints
update the add-to-do-item segue to modal
add Navigation Controller in View Controller and add two Bar Button Item