Feature/swift pm support

[JanRajtr]

Ticket

N/A

• Note: this is required for Vimeo staff only. If not applicable to your PR, use "N/A".

Pull Request Checklist

• [x] Resolved any merge conflicts
• [x] No build errors or warnings are introduced
• [x] New files are written in Swift
• [ ] New classes contain license headers
• [ ] New classes have Documentation
• [ ] New public methods have Documentation

Issue Summary

• Adding the Package.swift file for support of swift package manager

Implementation Summary

• Package.swift created
• support from iOS 10 and Swift 5

Reviewer Tips

• Please check the Package.swift file

How to Test

• Try to fetch the package and use it as dependency within the app