Resources for learning Swift

[jtrudell]

On the learning resources page (http://exercism.io/languages/swift#learning), Swifty App is a good start. I would also add Apple's free iBook, The Swift Programming Language, which is pretty accessible: https://itunes.apple.com/us/book/the-swift-programming-language/id881256329?mt=11

[masters3d]

Do you mind doing a PR here?

https://github.com/exercism/xswift/blob/master/docs/RESOURCES.md

[masters3d]

Or maybe here. https://github.com/exercism/xswift/blob/master/docs/LEARNING.md

[jtrudell]

Will do.

[masters3d]

Thanks! #90