[gnome-music/wip/jfelder/songliststore-license] songliststore: Add copyright and license information

[Jean Felder <jfelder src gnome org>]

commit 690a8183a22465b1544b0acdd152c62bcb97f2d7
Author: Jean Felder <jfelder src gnome org>
Date:   Tue Nov 26 00:01:53 2019 +0100

    songliststore: Add copyright and license information

 gnomemusic/songliststore.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
---
diff --git a/gnomemusic/songliststore.py b/gnomemusic/songliststore.py
index bb73b3cd..8ced678e 100644
--- a/gnomemusic/songliststore.py
+++ b/gnomemusic/songliststore.py
@@ -1,3 +1,27 @@
+# Copyright 2019 The GNOME Music developers
+#
+# GNOME Music 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 2 of the License, or
+# (at your option) any later version.
+#
+# GNOME Music 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 GNOME Music; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# The GNOME Music authors hereby grant permission for non-GPL compatible
+# GStreamer plugins to be used and distributed together with GStreamer
+# and GNOME Music.  This permission is above and beyond the permissions
+# granted by the GPL license by which GNOME Music is covered.  If you
+# modify this code, you may extend this exception to your version of the
+# code, but you are not obligated to do so.  If you do not wish to do so,
+# delete this exception statement from your version.
+
 from gi.repository import Gfm, Gio, GObject, Gtk
 from gi._gi import pygobject_new_full