SHELL

add submodule

$ git submodule add <remote_url> <destination_folder>

git submodule add

# Submodule is the git feature allowing a repository to include another 
# repository, with control on the branch of shared repository that is 
# considered by the host repository.

# In order to, for your own application, to create a submodule 
# associating the shared repository's main branch, do the following:
"""
git submodule add -b main [URL to Git repo] 
git submodule init
"""
# Now you can do
"""
git add .
git commit -m "folder is now a reusable result"
git push
"""