Add more linters to spotless and editor-config entries

We should add some more prettier linters to spotless for consistency on the format for different files:

[ ] Markdown files (README.md and src files)
[ ] YAML files (quarkus configuration)
[ ] Maybe also JSON files (as the test files sometimes are not as readable as desired - nevertheless, it would be important to keep in mind that this can break tests, at least until #25 is evaluated)
[ ] SQL-files (flyway-migration scripts)

Also, in the .editorconfig we can include some rules to be picked by the different editors. In addition, the main editor that I am using is IntelliJ and we can maybe include some specific rules for that one (if somebody wanna contribute we should make clear that it is also possible).

ygojson / ygojson-tools

Add more linters to spotless and editor-config entries #125