OZG-8696 Hinzufügen von Open Source Files

Lukas Malte Monnerjahnrequested to merge
OZG-8696-open-source-files into main
  • add CHANGELOG, CODE_OF_CONDUCT, CONTRIBUTING, SECURITY files
  • add general info to README
  • add THIRD_PARTY_LICENSES
Edited by Lukas Malte Monnerjahn

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