Adding WiP public review summary.

NOT to be considered finished or official in any way until the
public review period has ended and the TG has collected remaining
feedback and acted as requried.

 On branch master
 Your branch is ahead of 'origin/master' by 1 commit.
   (use "git push" to publish your local commits)

 Changes to be committed:
	new file:   doc/scalar/public-review-summary.adoc