Day 80 of #100DaysOfSwiftUI

Start 100DaysOfSwiftUI from 2020.Mar.18th.

Day 80: Project16, part two
done with 45min.

New findings: followings are new findings

• Result and how to handle it
• var x { willSet{ objectWillChange.send()} } } will be key for customization
• Image has modifier "interpolation" with it, we can control how interpolation works for passed image