Add helpful information to the SETUP.md about swift HOT 3 CLOSED

I think @masters3d added the basic information in c9ae5bc

I have a slightly different way of running the test that I find to be easier. Instead of creating one xCode project for each exercise, I have one generic exercism xCode project. Then I just need to drag in the newest exercise, create the new file for the solution and add that to the Tests target.

Curious how everyone else does it since it seemed like the original setup was a lot of extra overhead when I got started. Maybe this should be discussed in a different issue though?

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I think using IOS as the test bed is the most straightforward way. (maybe not the fastest)
But if you have suggestions on changes see the docs repo
https://github.com/exercism/docs/blob/master/app/pages/languages/getting-started-with-swift.md

A lot of issues could be introduced when you start to mix multiple projects. For example. You cant have files with the same name in one xcode project.

I personally just use an osx project since those build faster for me but that can get confusing when people see something like this and accidentally click yes.

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Yeah, I suppose I can see how having all the tests in one project could get confusing if you wanted to name your solution the same as a file that already exists.
Usually I end up naming it the name of the class that is going to be tested though. Or if it's an extension I add the in the filename what is getting added to the class.

I will have to give an osx project a try since ios projects always open the simulator.
Eitherway, I think this issue can be closed with your commit earlier?

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