Is your feature request related to a problem? Please describe.
Scorecard should provide a badge for repositories to include in their README to display their compliance.

Scorecard badges

The scorecard should provide badges similar to other https://github.com/badges/shields OSS badges for compliance.

Goals

• Scorecard should provide badge results based on scorecard runs on the (cron)server to ensure compliance and validation. Similar to Codecov.
• Scorecard should provide a predictable API to fetch the badges. An example could be https://somefqdn/github/ossf/scorecard/badge
• Scorecard results calculation - TBD - The discussion of calculation should be a separate issue.

Implementaion

• Scorecard would create a separate HTTP application (within the scorecard repository) which would generate the badge.
• Scorecard would use the Results from the scheduled cron run to generate the badge. The results of the cron are stored within the GCS bucket as latest.json
• The HTTP application would be stateless.
• The application would be hosted on Google Cloud Run which will scalability with less maintenance.

In this example

• The k8s repository README.md would request the scorecard badge service for the badge
• The badge service would fetch the results from the GC bucket which has the latest.json results from the cron job
• The badge service calculates the score and returns the SVG.