Make a requirenments file for the lrp study tool

[elboyran]

It would be good to have requirements file listing all python package attendances (requirements) for the study tool to work.

[JoostBerkhout]

Maybe we can use pipreqs for that? See the following link:

https://github.com/bndr/pipreqs

[fdiblen]

probably pipenv would be a better option for this.
https://github.com/pypa/pipenv