Today I Learned: Git Submodules
13 Nov 2015
A short update about submodules in git.
Let’s start by adding an existing Git repository as a submodule of the repository that we’re working on. To add a new submodule you use the git submodule add command with the absolute or relative URL of the project you would like to start tracking.
By default, submodules will add the subproject into a directory named the same as the repository.
More information you can find in 7.11 Git Tools - Submodules