Add basic HTML structure and array properties to TodoApp
Create new TodoItem with validation and shovel to unfinishedTasks array on TodoApp
Add complete to TodoItem
Add DOM elements to todoItem constructor
Add new TodoItem to DOM successfully
User can add, complete, and delete todo items
Fix button text
Throws an error in the DOM when user doesn't input anything
Move create task functionality to TodoApp namespace
Add created at to todo
Add completed at
Add created at back to finished task list
Sorting functionality added