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

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Note

Add FOSSA status badges and a License section to README.md, keeping the Certificates API link.

• Documentation (README.md):
  • Add FOSSA status badge under Getting Started.
  • Add License section with large FOSSA report badge.
  • Keep/clean up the Certificates API documentation link.

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