adding a read me for the release of OF


so, here's the question we should ask, "what does someone who downloads OF for the first time see?"   Ie, what does post unzip (or untar) OF look like?

I think we should remove the readme when we package OF and use something like this readme -- it makes little sense for people who are not using git.  I've started a readme here to try to explain a bit of what people are seeing.  I'll keep adding to the PR, ideas and help welcome.