repository is cloned at the specified path, added to the
changeset and registered in .gitmodules. If no path is
specified, the path is deduced from the repository specification.
+ If the repository url begins with ./ or ../, it is stored as
+ given but resolved as a relative path from the main project's
+ url when cloning.
status::
Show the status of the submodules. This will print the SHA-1 of the