Changed module so that the 01-basics exercises only use YUI

None of the other exercises in this section had AUI components, only YUI
ones, and since this example works with the YUI "node" module it seemed
logical to keep the exercises more consistent. AUI components are used in
the next group of exercises.
Syntax correction for creating a new div

div elements are supposed to have an opening and closing tag, and are not
self closing, so the previous code was inaccurate, although it did work
Changed Toggle Visibility Button to use <button> tag

Before, it was an input element with type="button", but this is more
correct
Added README.md for 01-basics

This file contains step by step directions for the exercises in this
folder