A small documentation for the API for Mobiliteit.lu
Look at the "documentation" file for the documentation
Hafas API Guidelines: https://transportdatamanagement.ch/content/uploads/2020/04/HRDF.5.20.39-Guidelines-e.pdf
DB-Documentation for Hafas API: https://download-data.deutschebahn.com/static/apis/fahrplan/Fpl-API-Doku-Open-Data-BETA-0_81_2.pdf