Upgraded readme

I started some edits in the README and it got out of hand, so now I swept the whole thing and made many edits to the structure and language.

Structure & content is still the same, it is all form and language use:

Main thing is I changed the familiar you-form to a bit more technical (there is a academic name for these language style but they escape me for the moment).

Plus a load of smalls stuff, see the commit note.

Note: there were many hard-returns in the markdown, but this is terrible to edit. Instead let the lines flow and use your editor do the soft-word-wrap (I use MarkDownPad2)

I send the PR for review, feel free to edit the branch before pulling.