Build a TODO list web app using Sinatra

Core Features

• Add a todo
• Edit a todo
• Mark a todo as complete
• Filter todos by "All", "Active" and "Complete"
• It needs to look good ;)

Stretch goals

• Store todos in Postgres
• Clear completed todos
• Untoggle completed todo
• Todo "complete by date"
• Filter by "Overdue"

Stretch stretch goals

• render page to look more like Elm examples