Create tutorial

[ronnyroeller]

The docs have right now very high-level intro (README) and very low level API docs (auto generated). Both are great but it would be good to have sth in the middle as well: guiding the user from the high-level to the practical, low-level. A tutorial could nicely bridge this, explaining the video concepts based on a concrete example.

It would be particularly helpful to cover working with events (getting across how it works - and why it works like that).

For inspiration, here an example tutorial from Remirror.