work in progress Documentation to be moved to github

[AndreyB]

As of Dec 2018 rusEfi documentation is still really poor. A few people seem to be interested to help and this is great!

Existing rusefi mediawiki instance has pros and cons - on the one hand it's easy for people to contribute, on the other hand there is pretty limited access control model and history. I would like to suggest that we start moving to https://github.com/rusefi/rusefi_documentation for documentation - at least I suggest we give it a try