Add license scan report and status

[fossabot]

Your FOSSA integration was successful! Attached in this PR is a badge and license report to track scan status in your README.

Below are docs for integrating FOSSA license checks into your CI:

• CircleCI
• TravisCI
• Jenkins
• Other

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fossabot
Once this PR has been reviewed and has the lgtm label, please assign psschwei for approval. For more information see the Kubernetes Code Review Process.

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[linux-foundation-easycla]

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[knative-prow]

Welcome @fossabot! It looks like this is your first PR to knative-extensions/homebrew-kn-plugins 🎉

[fossabot]

Your license scan is passing -- congrats!

Your badge status is now updated and ready to merge: