Execute the install.sh script:
$ ./install.sh
If this is the first time the script is being run, it will prompt for the name and email address to use in ~/.gitconfig:
$ ./install.sh
Enter name for .gitconfig: John Doe
Enter email for .gitconfig: john@example.com
Once the prompt(s) are answered, it will not prompt again on future installations unless the generated file git/.gitconfig_link is deleted.