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# Add the to-be submodule url to .gitmodules;
git submodule add <repo-url> <local-path>

# move the .git directory to the submodules space;
git submodule absorbgitdirs <local-path>

# Update git and all submodules
git submodule update --init --recursive

# Commit without githooks
git commit -am "..." --no-verify