Per `awesome-cv.cls`, this project is available under the Latex Project
Public Licence, v1.3c (SPDX: LPPL-1.3c) from the copyright holder Claud
D. Park <posquit0.bj@gmail.com> (aka @posquit0).
This commit adds a LICENCE file with a copy of that licence, to
hopefully make it clearer to users by showing up more conveniently in
GitHub for example.
Closes#20, closes#245, and closes#296.
