Copyright for haskell-gi-gdk source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: gi-gdk
Upstream-Contact: Iñaki García Etxebarria (garetxe@gmail.com)
Source: https://hackage.haskell.org/package/gi-gdk

Files: *
Copyright: Will Thompson, Iñaki García Etxebarria and Jonas Platte
License: LGPL-2.1+

Files: debian/*
Copyright: held by the contributors mentioned in debian/changelog
License: LGPL-2.1+

License: LGPL-2.1+
 See /usr/share/common-licenses/LGPL-2.1 on your Debian-based system.