Move credits from README to AUTHORS.

As long as autoconf requires an AUTHORS file, might as well use it.
Refer to the public commit logs for all contributors - that's what
they're for.

AUTHORS

@@ -0,0 +1,15 @@
+Credits
+-------
+OpenBSD's native ntpd was written by Henning Brauer and Alexander Guy in 2004.
+It has seen improvements from many others as well. Please see the commit logs
+for an exhaustive list of contributors.
+
+Portable OpenNTPD versions 3.9 and earlier were developed by Darren Tucker,
+with contributions from Christian Weisgerber, Jason Mader and Anthony
+O.Zabelin., and were based heavily on OpenSSH portable. It also has seen
+improvements from many others. Refer to the commit logs for an exhaustive list.
+
+This new portable version is based on the LibreSSL portable framework by
+Brent Cook.  It includes patches from FreeBSD, Debian and Gentoo OpenNTPD
+packages, along with with compatibility code from the portable OpenSSH and
+original portable OpenNTPD trees.

README

@@ -6,19 +6,6 @@ OpenNTPD has a web site at http://www.openntpd.org/
 
 The current portable tree can be found at https://github.com/openntpd-portable
 
-Credits
--------
-OpenBSD's native ntpd was written by Henning Brauer and Alexander Guy.
-
-Portable OpenNTPD versions 3.9 and earlier were developed by Darren Tucker,
-with contributions from Christian Weisgerber, Jason Mader and Anthony
-O.Zabelin., and were based heavily on OpenSSH portable.
-
-This new portable version is based on the LibreSSL portable framework by Brent
-Cook. It includes patches from FreeBSD, Debian and Gentoo OpenNTPD packages,
-along with with compatibility code from the OpenSSH and original OpenNTPD
-portable trees.
-
 Platform Requirements
 ---------------------
 adjtime() and settimeofday() syscalls or equivalent.