Provide introductory videos for each project

[Jegp]

We should provide introductory videos for each project to provide helpful information for new contributors.
The videos should include a stepwise guide to

1. How to get the project running in a development mode
2. How the code is structured
3. How to solve a small, token problem

This issue tracks the progress for all projects:

• Faery
• NIR
• NIRTorch
• Norse
• snnTorch
• Spyx