For Git Repository, to add ToolBox as a submodule, use Git and run:
cd "{%ThePathOfGitRepository%}"
git submodule add "https://github.com/YUDONGLING/TOOLBOX.git" "Pkg"
For Git Repository, to checkout ToolBox, use Git and run:
git submodule init
git submodule update
For Windows Filesystem, use CMD and run:
mklink /j "{%ThePathYouLikeToUseToolBox%}\Pkg" "{%ThePathOfTheToolBox%}"
For MacOS Filesystem, use Termail and run:
ln -s {%ThePathOfTheToolBox%} {%ThePathYouLikeToUseToolBox%}/Pkg