- Move ERRORES.md to documentacion/
- Add PREREQUISITES.md with system requirements and setup steps
- Update documentacion/README.md as documentation index
- Simplify root README.md as project summary
- Fix JSON syntax errors in api.md
- Fix typos in verifactu.md and formato_datos.md
- Update README.md with current status (anulation implemented)
- Move all Python test files to test/ folder
- Remove certificates from data/certs/ and test/certs/