Adds content from all *.txt files under Documentation directory and its subdirectories:

               $ git add Documentation/\*.txt

           Note that the asterisk * is quoted from the shell in this example; this lets the command include the files from subdirectories of
           Documentation/ directory.

       ·   Considers adding content from all git-*.sh scripts:

               $ git add git-*.sh

    // For a new account, there are 2 sub-cases:
    // $self_register: A user creates their own, new, account
    //   (path '/user/register')
    // $admin_create: An administrator creates a new account for another user
    //   (path '/admin/people/create')
    // If the current user is logged in and has permission to create users
    // then it must be the second case.
    $admin_create = $register && $account->access('create');
    $self_register = $register && !$admin_create;