Add Functions Content

[paladique]

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Mention any other details that might be useful

Add Functions documentation and demos to repo.

This includes:

• Readme file in the root, including:
  • Important technical notes and talking points
  • Instructions on how to run demo
• Code in a separate folder