Swift Package Manager support

[bbernberg]

Do you plan on adding support for SPM? Thanks in advance.

[adjunct]

@bbernberg currently we have no such plan, but I have opened a request for enhancement and would review when considering roadmap ahead. you can follow progress here - https://feedback.cloudbees.com/app/#/case/60051

[arnauddorgans]

I wrote a PR for SPM support #6

[AsafRollout]

was done