Implement the Getting Things Done methodology

This module implements a simple personal to-do list based on tasks. It adds an editable list of tasks simplified to the minimum required fields in the project application.

The to-do list is based on the Getting Things Done methodology. This world-wide used methodology is used for personal time management improvement.

Getting Things Done (commonly abbreviated as GTD) is an action management method created by David Allen, and described in a book of the same name.

GTD rests on the principle that a person needs to move tasks out of the mind by recording them externally. That way, the mind is freed from the job of remembering everything that needs to be done, and can concentrate on actually performing those tasks.