establish the "Glossary" as foundation for examination questions

[gernotstarke]

When creating and discussing examination questions, we should always provide the corresponding terminology and/or references in the glossary.

[skogsbaer]

#534 adds links to the glossary for LG-{1,2,3}

[skogsbaer]

#534 was the easy part. Here are some terms from LG-{1,2,3} that should probably be in the glossary, but currently are not:

• functional requirements
• product owner
• requirment engineer
• quality assurance
• data models
• Conveys law (with reference)
• Goodhart's law
• KISS
• YAGNI
• CUPID
• Postel's law

Right now, I don't have the time to continue, so I just leave it as a todo list.