Badge metadata

[nuest]

This recent NISO report about badges gives some recommendations about what badge metadata should be made available in a structured form. We should revisit if all the information is available via the codecheck.yml, and think about how badge and YAML file could be connected.

https://doi.org/10.3789/niso-rp-31-2021

Also, the idea to add a crpytographic hash in the image header for authentication of the badge source is interesting, but would require an own badge server.

It's a pity that they have ROR-R (reproduced) only as an extension of ROR (reviewed), whereas CODECHECK does reproduction without too much code review.