Creation of Videos help document

[sarashinai]

Summary

I have created a VIDEOS.md file in the help directory with a curated and annotated list of all the Invoke YouTube videos. The purpose is for the videos to be integrated into Invokes web presence and to make finding specific content easier.

Related Issues / Discussions

QA Instructions

Merge Plan

Checklist

• [ X ] The PR has a short but descriptive title, suitable for a changelog
• [ ] Tests added / updated (if applicable)
• [ X ] Documentation added / updated (if applicable)