Well, it's not that easy to explain. It is my leisure project. This app shows me (or any other student or teacher of the NIG) where and when I have to go to which lesson, whether there are substitutions or if I can continue writing this app because someone isn't coming for class.

The documentation will be found in the docs folder. (html & md)
Currently they aren't available.

Never.

There will be an official version - at any point in time.