Proposal: German (Deutsch) translation for Community Exercises

Hi! I'd like to contribute a German translation of the Rustlings exercises to the
Community Exercises list.

I've scaffolded the project with rustlings dev new and translated the first sector
(00_intro: intro1/intro2, including the real hints and solutions), validated with
rustlings dev check.

Repository: https://github.com/Kernwaechter/rustlings.de

Before translating the remaining ~90 exercises, I wanted to check:

• Is there already an existing effort for a German translation that I should be aware
  of / join instead of duplicating?
• Any guidance on scope or conventions I should follow (e.g. how the existing
  Japanese/Ukrainian/Korean translations handle canonical phrases like
  "Hello, world!")?

Happy to share progress as I go.