Add a user (cannot be admin) rudimentary version

Now, 3 (username, password) pairs work:
(stephenattech, GodIsGood414),
(katattech, GodIsGood413), and
(jianattech, GodIsGood415),
but only the stephenattech is an administrator. The "User Account
Management" button only shows up if you log in as stephenattech.
Also, as of right now, there are many security holes, you can only add
users, not delete them, and you cannot add more admin users or change
passwords.