[SIGMON-362] README, dummy output tests

Context

• task: https://its.cern.ch/jira/browse/SIGMON-362

What was done

• README updated with the 2 new classes and the general description/acceptance criteria
• 'dummy' tests of the output created (we do not assert the output but that it was generated successfully)

TODO

QA

• http://sonar/project/issues?branch=SIGMON-362_readme_tests&id=lhc-sm-qh&resolved=false
• code was unit tested

Review objectives

• assessment of code functionality
• assessment of code quality
• identifying potential refactorings / logic common to other projects
• knowledge sharing