On revprop-cache branch: Describe goal and status.
On revprop-cache branch: Describe goal and status.

* BRANCH-README: new

git-svn-id: d05e0e358a711274fc7d00753ebb184e98179213@1298549 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion