Copyright for youker-assistant source package in Yangtze V1.0

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: kylin-assistant
Upstream-Contact: Ubuntu Kylin Team 
Source: https://github.com/KylinAppCenter/kylin-assistant

Files: *
Copyright: Copyright (C) 2021 KylinSoft Co., Ltd.
           Copyright (C) 2019 Tianjin KYLIN Information Technology Co., Ltd.
License: GPL-3

License: GPL-2+
 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 2 of
 the License, or (at your option) any later version.
 .
 On Debian and Ubuntu systems, a copy of the GNU General Public License version
 2 may be found in the file /usr/share/common-licenses/GPL-2.

License: GPL-3
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License version 3 as
 published by the Free Software Foundation.
 .
 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.
 .
 On Debian/Ubuntu systems, the full text of the GPL v3 can be found in
 `/usr/share/common-licenses/GPL-3'