Copyright for cdk source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: cdk
Source: http://sourceforge.net/projects/cdk/

Files: *
Copyright: 1997-2019, The CDK Development Team (see AUTHORS.txt for the full list)
License: LGPL-2.1

Files: debian/*
Copyright: 2019, Andreas Tille 
 2019, Andrius Merkys 
License: LGPL-2.1

License: LGPL-2.1
 On Debian systems, the full text of the LGPL-2.1 license
 can be found in the file '/usr/share/common-licenses/LGPL-2.1'