Add code and documentation style

[ClemensLinnhoff]

Reference to a related issue in the repository

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Add a description In SL-1 certain style rules are enforced by the CI pipeline. Therefore, these rules should be explained in the contributing documentation. These are general rules for code and documentation styles, that do not only apply to sensor models.

Take this checklist as orientation for yourself, if this PR is ready for Maintainer Review

• [x] My suggestion follows the governance rules.
• [x] All commits of this PR are signed.
• [x] My changes generate no errors when passing CI tests.
• [x] I updated all documentation (readmes incl. figures) according to my changes.
• [x] I have successfully implemented and tested my fix/feature locally.
• [x] Appropriate reviewer(s) are assigned.

[ClemensLinnhoff]

I think we actually have to add the CI pipeline check for markdown here :D

Say no more :)

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