Basic implementation

[thescientist13]

Implement a basic Todo App

resolves ProjectEvergreen/project-evergreen#24

TODO (basic)

1. Get value from input (add todo)
2. push to todos array
3. render the todos array
4. delete a todo
5. mark a todo as completed
6. edit a todo? - see As a user I should be able to edit a Todo item in the list inline #5
7. Use repeat
8. Figure out true and proper data binding

TODO (advanced and will do as part of other tickets / example project?)

1. Font Iconography / styling (importing a vendor library) - see Add some styles / design to the application #6
2. Routing (active, completed, etc) - see Add support for route based code splitting w/ lazy loading project-evergreen#2
3. Passing callback functions? (state management - Redux?) - see Document Styleguide project-evergreen#21

[thescientist13]

Interesting discussion on being able to pass more than just Strings via attributes (like Arrays, Objects.
WICG/webcomponents#519

Will see what the best way is to handle callbacks. Maybe a case for something like Redux, if it presents better developer experience / ergonomics?