Add static quality label about catalogue

[jason-fox]

Labels/Badging requirements for code quality within FIWARE enablers should be raised against the Developer's Guidelines - if you wish to strengthen the statements, please raise it there.

I think the actual requirement will depend on the language used. For example, I would like to enforce a linting step (e.g. prettier, Checkstyle) as a pre-testing step on builds which should cover the minimum source quality part of your statement.

I assume there would be different minimum thresholds for Incubated vs Mature Generic Enablers.

Once Code Quality is enforceable across the board, the relevant badge(s) can be added here.

[jason-fox]

A decision has been made not to add this to the catalogue umbrella repo for now. Closing