Area for more documentation

[vingerha]

With your GH being good (for me) but requiring more details for a lot of others, and the huge (!) post on HA forum, there are many questions that repeat themselves.
I was thinking on adding stuff / examples of common (are they common?) situations.
Now, GH allows wiki which seems nice but is less simple to clone/update esp. from a PR.
If you agree to add pages/doc, that is of course the first question, do you have a proposal on how to go about?