Add NetworkMonitorKit

[Rohijulislam]

The package(s) being submitted are:

• NetworkMonitorKit

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 5.0 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.

[cla-bot]

Thanks so much for submitting a pull request. We appreciate your contribution!

We require all contributors to sign our Contributor License Agreement (CLA) before we can merge any code, and we don't currently have a record of a signed CLA for @Rohijulislam. Please email [email protected] and let us know you need to sign a CLA, and we'll get the template over to you.

[finestructure]

Add via #9111, thanks for the submission!