Copyright for fonts-lklug-sinhala source package in Focal

This package was debianized by Anuradha Ratnaweera 

Upstream Authors:
  Anuradha Ratnaweera 
  Harshula Jayasuriya 

See CREDITS file for the history of outlines.

Copyrights:
    Copyright © 2004,2008 Anuradha Ratnaweera and Harshani Devadithya
    Copyright © 2006 Harshula Jayasuriya
    Copyright © 1994, The Wellcome Trust, London

License:

    LKLUG font is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2, 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, version 2, for more details.

    The Debian packaging is (C) 2004,2008, Anuradha Ratnaweera, and is
    licensed under the GNU General Public License, version 2.

    You should have received a copy of the GNU General Public License,
    version 2, with the Debian GNU/Linux distribution in the file
    /usr/share/common-licenses/GPL-2; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301 USA.