Complete the BW4T tutorial to MATRX

[thaije]

Is your feature request related to a problem? Please describe.
At the moment, there is a very basic (out of date?) tutorial available for new users here, however nothing in-depth.

Describe the solution you would like
There is a nice BW4T world available that can serve as a more indepth introduction for new users, but the tutorial is still empty. This tutorial should be completed to give a better introduction for new users.

Also mention this tutorial on the Github main readme

Describe alternatives you have considered
Make an introduction video and put it on the website, or create some other simple task as tutorial. Both still viable as well.

[jwaa]

Removed from Release v2.1.0 as #78 is not part of this milestone any longer.

[thaije]

@jwaa as an alternative, is it not possible to make the tutorial for the simplified BW4T task? As a first hands-on tutorial the task can be quite simple.