Add SwiftLint and configure for Style

[MadGeorge]

Hi! Did not find any references to a linter and code style guides in the repo. It would be nice to have while the project does not become large and many other contributors joined the repository.

To not go too hard on a code style I would suggest using the existing one https://google.github.io/swift/ and for the linter SwiftLint. These two are battle-tested and used in many projects.

Feel free to close this issue without a response.

[STREGA]

I like it. I don't think I'll adopt a textbook of style requirements, but I'll look into SwiftLint and see if it can be configured to enforce a coding style to make it easier for contributors in the future.

[gregcotten]

Just simply running

brew install swiftformat
swiftformat --swiftversion 5.8.1 .

and seeing what has changed could give you some ideas on what style guidelines you like/dislike.

I will probably mirror this repo with (mostly) swiftformat guidelines on top as I like their default rules and it is widely adopted, making the readability much better.

[STREGA]

I'll look at swift-format too. I'll likely go with the style and tool the majority of official swift projects are using.

Going to wait to implement the style until right before the documentation audit which will happen immediately before v1.0.0 is tagged.

[STREGA]

Using both SwiftLint and SwiftFormat.
Fixing all format issues will take some time and completion will be recorded in #43. Closing this.