Move most documentation out of README.md

[eyalroz]

This repository's README.md is way too long. The documentation specifics should be in a separate .md file, on the wiki, or both; and the main README.md should focus on the sections other than the Detailed Examples. In fact, Overview is also too long; I'd stick to a couple of examples, no more than that for the repo landing page.

[muellan]

Agreed. That's already on my TODO-list.