[Codemeta] 3 fields required by OSSR are missing

[kresan]

Result of eossr-codemeta-validator:

There are 3 errors:.

'softwareVersion not provided in the codemeta schema but is required'
'maintainer not provided in the codemeta schema but is required'
'readme not provided in the codemeta schema but is required'

[ChristianTackeGSI]

See also:

• https://github.com/FairRootGroup/FairMQ/pull/478/checks
• ci: Check codemeta.json #478
• codemeta: Add GSI as "maintainer" #479

Dennis and I are in tight contact regarding the version field. This one is not as simple as it seems. I even had a discussion on the last OSSR monthly meeting with some … interesting … results.

[dennisklein]

Now it is green: https://github.com/FairRootGroup/FairMQ/actions/runs/6148931619/job/16683739521, it will be merged to master on next release.

Thx @ChristianTackeGSI for the PRs!