Description: https://ru.hexlet.io/professions/php/projects/48
$ installation process
$ comparing 2 flat .json files with plain, text and json renderers
$ comparing 2 nested .yaml files with plain, text and json renderers
composer global require influx/php-project-lvl2
gendiff (-h|--help)
gendiff (-v|--version)
gendiff [--format <fmt>] <firstFile> <secondFile>