Added input-processing-output

[guettli]

Pull Request Checklist

Please double check the items below!

• [ x] I have read the Contributor Guidelines.
• [x ] I have not directly copied text from another location (unless explicitly indicated as a quote) or violated copyright.
• [x ] I have linked to the original Law.
• I have quote the law (if possible) and the author's name (if possible).
• [ x] I am happy to have my changes merged, so that I appear as a contributor, but also the text altered if required to keep the language consistent in the project.

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[trident-job]

The PR is well formed and valid

[trident-job]

Just need to reference it in the TOC