Add README with copyright and license for images

diff --git a/data/icons/README b/data/icons/README
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+Copyright and license for images
+================================
+
+
+Files: weechat_icon_32.png, bullet_green_8x8.png, bullet_yellow_8x8.png
+
+  Copyright (C) 2011-2013 Sébastien Helleu <flashcode@flashtux.org>
+  Released under GPLv3.
+
+
+
+Files: application-exit.png, dialog-close.png, dialog-ok-apply.png,
+       edit-find.png, help-about.png, network-connect.png, network-disconnect.png,
+       preferences-other.png
+
+  Files come from Debian package "oxygen-icon-theme":
+
+    The Oxygen Icon Theme
+      Copyright (C) 2007 Nuno Pinheiro <nuno@oxygen-icons.org>
+      Copyright (C) 2007 David Vignoni <david@icon-king.com>
+      Copyright (C) 2007 David Miller <miller@oxygen-icons.org>
+      Copyright (C) 2007 Johann Ollivier Lapeyre <johann@oxygen-icons.org>
+      Copyright (C) 2007 Kenneth Wimer <kwwii@bootsplash.org>
+      Copyright (C) 2007 Riccardo Iaconelli <riccardo@oxygen-icons.org>
+      and others
+
+    License:
+
+      This library is free software; you can redistribute it and/or
+      modify it under the terms of the GNU Lesser General Public
+      License as published by the Free Software Foundation; either
+      version 3 of the License, or (at your option) any later version.
+
+      This library 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
+      Lesser General Public License for more details.
+
+      You should have received a copy of the GNU Lesser General Public
+      License along with this library. If not, see <http://www.gnu.org/licenses/>.