Cleaned up the formatting

Not showing + if there is no descrition
cleaned up code formatting
Can now mark task as complete

Added ability to mark tasks as complete.
When the page is reloaded a task that is complete is automatically
checked
Seperate into different files

Seperated the css and js from the html
Expand/Hide description

Added functionality so that when the description is expanded the '+'
turns into a '-'
Added functionality to remove completed tasks

Added a button and functionality to remove completed tasks
Visually aligned the items in the list

changed the padding and font to make things line up nicely