Completed Step 1 of todo.php in codeup_todo_list

Created new directory of codeup_todo_list and todo.php. Copied example
code to run To Do list program.
Completed Step 2 of todo.php

Added strtoupper() around initial user input to change any lower case
strings to upper allowing either lower or upper case inputs to be
accepted. Testing adding a new item, removing an item, and quitting.
Step 3 of todo.php

Added and unset ghost array index of 0 in the “do” so that new items
will start at an array index of 1.