Improvement: Document Release Management Process

[markert-r]

Important

Make sure to link this issue with the PR for your improvement.

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

• this includes workproducts definition and linking to standard
• this includes guidance definition and linking to standard

Prepare presentation in audit session

[kroehnd]

• Create a "getting started" section
• Create a guideline
• Describe the Release process
• Create templates for work products
• Create relevant Checklists