Add a free implementation of the MaDUM tool

[fatemeee33]

This feature implements a free version of the MaDUM tool used to calculate test effort, as described in the following article:

https://www.researchgate.net/publication/220693053_Testing_Object-Oriented_Software_-_Life_Cycle_Solutions.

Additionally, the version implemented in Java is available at the following link:

https://github.com/moar82/madum.