関連ワード:  how to install git submodules    how to add git submodules    how to set up git submodules    how to add git submodule with branch    how to add git submodule commit    how to add git submodule with tag    how to add git submodule manually    how to add git submodule to a repo    how to add git submodule to project    how to add new git submodule