[minor] in your README, consider comparing with org-tree-slide-mode

[gasche]

I use the org-tree-slide mode, and from the front (github) page of org-present I cannot tell how the two compare. I suppose that some readers encountering your project will have the same question.

Could you maybe include a quick discussion of the comparison between the two?

(Another thing that I would have found helpful on the README is a screencast to get a quick visual demo of your mode. This sounds like much more work.)