Update iOS app from swift 3.1 to latest SwiftUI

This iOS app is a 5 tab app in swift 3.1. This is a project to update it to the currrent version of SwiftUI. It is about replicating the additional functionality. The only additions are to provide a sign in with apple option for accounts and an ability to delete all account details (including saved notes). The app connects to firebase to retrieve json data. It also uses firebase to store simple text notes. The original xcode files will be provided.