feat: quickstart in swift is now runnable

[riverKanies]

If we do want to move forward with running swift examples as scripts like this, here's the updated quickstart

Matthew seems fine with it

@reez here's the updated version, only required minor changes from the basics.md you had

[reez]

Code looks good, so whatever way you decide to do this (project, no project, etc) is good w me-

[riverKanies]

ok cool, I'll play around with a minimal xcode proj and see if that would make more sense

[notmandatory]

This looks good to me too, you can close #82. I thought you were using some sort of script tool but looks like you're just using swift package init --type executable which seems a minimal way to get started.

[riverKanies]

@thunderbiscuit looks like this is the direction the team wants to go

The main open q left to fully address here is exactly how much xcode specific details to include in the instructions. I think we can outline that stuff and also mention that the actual code example is not an xcode project. That's what it currently does but we can iterate a little on that