This is a copy of the file from:
http://ssl.icu-project.org/KEYS
The ICU project's PGP KEYS file was previously hosted on a separate
server that not all ICU-TC members have access too. This change copies
the current KEYS file into the top-level git repo, so that we can setup
a redirect on the website to point at the checked-in file, rather than
hosting it separately.