doc: Add MIT license notice.

* LICENSES: New.
--

Suggested-by: Jiri Kucera <sanczes@gmail.com>

AUTHORS

@@ -9,10 +9,13 @@ License (software): LGPL-2.1-or-later
 License (manual+tools): GPL-3.0-or-later
 
 
-GPGME is free software.  See the files COPYING for copying conditions.
+GPGME is free software.  See the files COPYING.LESSER and COPYING for
-License copyright years may be listed using range notation, e.g.,
+copying conditions, , and LICENSES for notices about contributions
-2000-2013, indicating that every year in the range, inclusive, is a
+that require these additional notices to be distributed.  License
-copyrightable year that would otherwise be listed individually.
+copyright years may be listed using range notation, e.g., 2000-2013,
+indicating that every year in the range, inclusive, is a copyrightable
+year that would otherwise be listed individually.
+
 
 List of Copyright holders
 =========================
@@ -23,6 +26,7 @@ List of Copyright holders
   Copyright (C) 2002 Klarälvdalens Datakonsult AB
   Copyright (C) 2004-2008 Igor Belyi
   Copyright (C) 2002 John Goerzen
+  Copyright (c) 2009 Dave Gamble
   Copyright (C) 2014, 2015 Martin Albrecht
   Copyright (C) 2015, 2018 Ben McGinnes
   Copyright (C) 2015, 2016, 2018

LICENSES

@@ -0,0 +1,38 @@
+Additional license notices for GPGME.                    -*- org -*-
+
+This file contains the copying permission notices for various files in
+the GPGME distribution which are not covered by the GNU Lesser
+General Public License (LGPL) or the GNU General Public License (GPL).
+
+These notices all require that a copy of the notice be included
+in the accompanying documentation and be distributed with binary
+distributions of the code, so be sure to include this file along
+with any binary distributions derived from the GNU C Library.
+
+* MIT License
+
+  For files:
+  - cJSON.c, cJSON.h
+
+#+begin_quote
+  Copyright (c) 2009 Dave Gamble
+
+  Permission is hereby granted, free of charge, to any person obtaining
+  a opy of this software and associated documentation files (the
+  "Software"), to eal in the Software without restriction, including
+  without limitation the ights to use, copy, modify, merge, publish,
+  distribute, sublicense, and/or sell copies of the Software, and to
+  permit persons to whom the Software is furnished to do so, subject to
+  the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+  OF CONTRACT, TORT OR OTHERWISE, ARISING ROM, OUT OF OR IN CONNECTION
+  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#+end_quote

Makefile.am

@@ -36,7 +36,7 @@ DISTCHECK_CONFIGURE_FLAGS =
 
 EXTRA_DIST = autogen.sh autogen.rc gpgme.spec.in  \
              ChangeLog-2011 m4/ChangeLog-2011     \
-             conf/whatisthis VERSION
+             conf/whatisthis VERSION LICENSES
 
 
 if RUN_GPG_TESTS