Let's start by getting the correct project setup.
You'll need to be on the latest Xcode (11.3 or so) - and it will be best if you are running Catalina - then we can get the canvas previews in XCode to work.
Setup
In Xcode - start a new project. Choose iOS and a single view app.
Fill out the project details. In my case - I will end up keeping the same details as the previous version of the app. Make sure to choose Swift as the language and SwiftUI as the User Interface.
Choose a place to save the project and enable git repository generation.
.gitignore
Xcode's git setup doesn't create a .gitignore file and it does have a bunch of files that we don't really want checked in. So - let's grab one.
GitHub maintains a really useful gitignore repository with lots of different templates. We'll grab the Swift one and save it as .gitignore in the project (add and commit) before we continue.
$ curl -o .gitignore https://raw.githubusercontent.com/github/gitignore/master/Swift.gitignore
$ git add .gitignore
$ git ci -m "Add .gitignore"
Libraries
Let's finish up the setup with two libraries we already know we want to add.
In Xcode - choose File > Swift Packages > Add Package Dependency.
In the package repository url field - enter https://github.com/Alamofire/Alamofire.git and hit next.
For version rule - keep Up to next major and next again.
In the final window - make sure that the package is checked off for your app's target and hit finish.
Now do the same with https://github.com/twostraws/CodeScanner.git
Finally git add and commit the changes.
Summary
The project is now ready to use - in the next step we'll start by testing out QR code scanning.