5c510208d2
- 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>