Copyright for log4cxx source package in Mantic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: log4cxx
Source: https://logging.apache.org/log4cxx/download.html

Files: *
Copyright: 2004-2023 The Apache Software Foundation
License: Apache-2.0

Files: debian/*
Copyright: 2005-2006 Andreas Fester 
           2008 Matthew Vernon 
           2014-2023 Tobias-Frost 
License: Apache-2.0

License: Apache-2.0
 Licensed under Apache License, Version 2.0; you may not use this work
 except in compliance with the License. You may obtain a copy of the
 License at
 .
 http://www.apache.org/licenses/LICENSE-2.0
 .
 On a Debian system, the license can be found at
 /usr/share/common-licenses/Apache-2.0 .