инициализировать, обновить или проверить подмодули (Initialize, update or inspect submodules)
Файлы (Files)
When initializing submodules, a .gitmodules file in the top-level
directory of the containing repository is used to find the url of
each submodule. This file should be formatted in the same way as
$GIT_DIR/config. The key to each submodule url is
"submodule.$name.url". See gitmodules(5) for details.
