[BUG] Linting instruction are missing

[jotterbach]

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PR #56 (#56) is failing. The error is due to liniting. However, there is not linting instructions for the contribution guidelines. In fact there is no link to the contributions guideline in the README of the repo

[winfried-ripken]

Thank you for pointing this out! There will be a major documentation update in the next few days, and I will include this in there.