Copyright for rust-temptree source package in Lunar

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: temptree
Upstream-Contact: Casey Rodarmor 
Source: https://github.com/casey/temptree

Files: *
Copyright: 2020-2021 Casey Rodarmor 
License: CC0-1.0

Files: debian/*
Copyright:
 2022 Debian Rust Maintainers 
 2022 Blair Noctis 
License: CC0-1.0

License: CC0-1.0
 Debian systems provide the CC0 1.0 Universal License in
 /usr/share/common-licenses/CC0-1.0