Add JSON export usable by fsinfoscreen
The main purpose of this application is to provide an interface which allows user friendly management of the calendar displayed by fsinfoscreen. To achieve this, we need to export the calendar data in the JSON format expected by fsinfoscreen.
As a user I want to be able to manage the calendar displayed fsinfoscreen with this application.
Modifying the calendar via the webapp should immediately update the calendar displayed by fsinfoscreen.