TodoList-class: Reference Class to represent todo list
In markwh/todoList: Project To-do lists using reference classes (R5)

Reference Class to represent todo list

items: List of TodoItems
nitems: Number of items in list
File: Associated csv file for reading and writing operations.
autowrite: Logical, automatically write file upon modification? Defaults to TRUE.

add(text, write = autowrite): Generate a new item to the todo list with the given text
add_item(newItem, write = autowrite): Add a TodoItem object to the todo list
comment(ID, text, erase = FALSE, write = autowrite): Add a comment to an item