Welcome to the code crew community.
I have moved your post to the App Development category.
Where did you get the Project Foodmia from and what is it supposed to do? Maybe you could add a link to the source in a reply.
The .xcworskpace is a file that can be generated by adding what’s known as cocoapods to a project. If you are unfamiliar with cocoapods, they are a means of adding 3rd party frameworks to your project in order to give you more functionality beyond the frameworks provided by Apple. That might be access to Google’s Firebase database for example just to name one.
After those pods are installed, the project must be opened by double clicking the .xcworkspace file rather than the .xcodeproj file.
Does that make sense?