Add comment regarding staleness of I-D committed in this repo.

doc/drafts/README

@@ -6,3 +6,10 @@ Internet-Drafts are draft documents valid for a maximum of six months
 and may be updated, replaced, or obsoleted by other documents at any
 time.  It is inappropriate to use Internet-Drafts as reference material
 or to cite them other than as "work in progress."
+
+OpenLDAP maintains copies of drafts for which we have and/or
+are planning "experimental" implementations of.  The I-D
+found in this directory may be stale.
+
+Please refer to http://www.ietf.org/ for latest revisions (and
+status).