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

[vercel[bot]]

@fossabot is attempting to deploy a commit to the Edge Team on Vercel.

A member of the Team first needs to authorize it.

[shige]

@toyamarinyon I will check the status of this PR first, so there is no need to review it. 🙏

[shige]

I've decided not to use it for now, so I'll close it.