- Introduced detailed documentation for `masterdata` service, outlining purpose, architecture, and ÖTO rule compliance.
- Highlighted its hexagonal architecture and Gradle multi-module project structure.
- Documented key APIs, domain models (`LandDefinition`, `Altersklasse`, `Platz`), and testing practices using Testcontainers.
- Emphasized the service’s role as a central source of truth for ÖTO-conformant reference data.
Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>
