iOS implementation, creation swift file

[andrewsystem0322]

Hi! :)

I guess is very necessary to add in the iOS steps specify the step regarding the siwft file, because if you create this file from VScode for example, you will have a couple of issues, I love this library, but I didn't implement the labrary from 1 year ago more or less and I forgot this problem, so I was fighthing again and until when I could remember was possible to implemente in iOS.

thanks and regards.