note: work in progress
just another todo cli app. go do things!
[adding to a todo]
todo add "item" #group #group2
[list all todos]
todo
[displaying a group of todos]
todo #group
[mark todos as done]
todo done 0
todo done #group
todo undone 0
todo undone #group
[delete todos]
todo delete 0
todo delete #group
todo clear
[hide done todos]
todo clean
todo clean #group