Core Data and iCloud Sync example iOS project

In the course of building an app, I ran into many brick walls and learned way too much about Core Data, iCloud sync, Collection and Table Views, and Diffable Data Sources.

There is documentation for each of those individually, but I could find no clear and simple example project that ties them all together in a neat little bow. So I wrote this example starter project to help others who want to accomplish the same thing.