Updated requirements for text user interface
Urwid is too complex for now
Simple menu system skeleton
Implemented add projects to list.

Also improved the menu layout a bit to separate the commands from the projects.

The projects are auto-assigned their option number by going through digits, then letters.
Converted add_item to create a Project instance
Add ticks when a project is selected
Show tick scale at top of menu
Merge pull request #1 from matthew-parlette/tui

Basic TUI