Copyright for python-markdown-include source package in Mantic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: markdown-include
Upstream-Contact: Chris MacMackin 
Source: https://github.com/cmacmackin/markdown-include

Files: *
Copyright: 2015-2023, Chris MacMackin 
License: GPL-3

Files: debian/*
Copyright: 2021-2023, Carsten Schoenert 
License: GPL-3

License: GPL-3
 On Debian systems, the complete text of version 3 of the GNU General
 Public License can be found in '/usr/share/common-licenses/GPL-3'.