Improvement: Document (Cyber)-Security process

[aschemmel-tech]

Document in score repository (until the process_description repo is available)

Create documentation according to "template": https://github.com/eclipse-score/process_description/blob/main/requirements_engineering/index.rst

based on standard IsoSae 21434 and S-CORE tailoring

this includes workproducts definition and linking to standard
this includes guidance definition and linking to standard
Prepare presentation in audit session