Use dashes in filenames

What is the pattern of the filename where an ADR is stored?

Considered Options

NNNN-title-with-dashes.md - format used by adr-tools
YYYY-MM-DD Title - see https://github.com/joelparkerhenderson/architecture_decision_record#adr-file-name-conventions

Decision Outcome

Chosen option: NNNN-title-with-dashes.md, because

NNNN provides a unique number, which can be used for referencing in the forms
- ADR-0001 in plain text and
- by @ADR(1) Java code (enabled by e-adr)
The creation time of an ADR is of historical interest only, if it gets updated somehow. The arguments are similar than the ones by Does Git have keyword expansion?
Having no spaces in filenames eases working in the command line
This is exactly the format offered by adr-tools