[SIGMON-573] add readme file to the python package

Context

• Zinur wants to be able to display the content of the README files present in the lhc-sm-powering folders in the beginning of the jupyter notebook

What was done

• Add those README files to the python package
• This solution was chosen because it allows for the README version to match the code version (DEV or PRO releases for example)
• Add a method to create useful timestamps table

TODO

• ?

QA

• code was not unit tested, because it's packaging related
• acceptance tests were written

Review objectives

• ? assessment of code functionality
• ? knowledge sharing