[Docs] Init documentation

[simonhir]

General documentation needs to be added:

• How to use the matching-service (internally)
• How to configure additional use cases (Dispatch & DMS)
• All required configuration described
• File flow through SWIM
  • Dispatch actions
• Architecture decision records
  • Presigned ULRs
• Internal operating manual ("Betriebshandbuch")
• System specification