Add https://gitlab.com/mattt/CommonMarkAttributedString

[mattt]

The package(s) being submitted are:

• CommonMarkAttributedString

Checklist

I have either:

• Run swift ./validate.swift.

Or, checked that:

• The package repositories are publicly accessible.
• The packages all contain a Package.swift file in the root folder.
• The packages are written in Swift 4.0 or later.
• The packages all contain at least one product (either library or executable), and at least one product is usable in other Swift apps.
• The packages all have at least one release tagged as a semantic version.
• The packages all output valid JSON from swift package dump-package with the latest Swift toolchain.
• The package URLs are all fully specified including the protocol (usually https) and the .git extension.
• The packages all compile without errors.
• The package list JSON file is sorted alphabetically.

[daveverwer]

Thanks Mattt!

I see there's both the GitLab repo and a GitHub repo in this PR. Unfortunately, until we get SwiftPackageIndex/SwiftPackageIndex-Server#485 implemented it's not possible to merge this as-is.

It looks like the GitHub repo is a mirror of the GitLab repo (or vice versa)? Maybe we could add the GitHub version for now and once we support GitLab, switch over to that? Is there a reason you wanted both in the index? It does look like a mirror situation at a first glance.

Thanks for the submission! I'm sorry we couldn't just merge it 😅

[daveverwer]

I created #884 so we could get this package into the index. Happy to chat more about the GitLab issue, or the duplicate package issue if there's anything to say.

Thanks for the addition, Mattt!