Add note in the file RELEASE.NOTES on the relevance of it.

This file is not distributed in the tarballs, only kept in
GIT for reference.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

RELEASE.NOTES

@@ -1,3 +1,10 @@
+DEPRECATED
+==========
+
+See the file ChangeLog for changes over the years.  The below is the
+Release Notes for Pavlin's last pimd release back in 2000, it is kept
+only as a historical reference and TODO.
+
 $Id: RELEASE.NOTES,v 1.3 2000/03/08 09:10:52 pavlin Exp $
 
 * Since pimd cannot reliably get preference and metric info from the kernel