Added Cyg-Win

Agent-Windows/OGP64/usr/share/doc/diffutils/AUTHORS

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+GNU diff was written by Paul Eggert, Mike Haertel, David Hayes,
+Richard Stallman, and Len Tower.
+
+GNU diff3 was written by Randy Smith.
+
+GNU sdiff was written by Thomas Lord.
+
+GNU cmp was written by Torbjorn Granlund and David MacKenzie.
+
+The diffutils manual was written by David MacKenzie, Paul Eggert, and
+Richard Stallman.  Parts are adapted by from a manual page written by
+Larry Wall, with his permission.
+
+Many other people have contributed to GNU diffutils, including Wayne
+Davison, Patrick D'Cruze, F. Thomas May, Greg McGary, Chip Rosenthal,
+and Eli Zaretskii.
+
+The following contributions warranted legal paper exchanges with the
+Free Software Foundation.  Also see the files ChangeLog and THANKS.
+
+Leonard H. Tower Jr.
+Torbjorn Granlund
+Mike Haertel
+David S. Hayes
+Randall Smith
+Richard Stallman
+F. Thomas May
+Wayne Davison
+Paul R. Eggert
+Chip Rosenthal
+Wayne Davison
+Patrick D'Cruze
+Eli Zaretskii
+
+
+Copyright (C) 2001, 2006, 2009-2013, 2015-2025 Free Software Foundation, Inc.
+
+This file is part of GNU diffutils.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.