Motivation: I am recommending a user to do temporary this for debugging purposes, after solving:
System.out.println(ScoreManager.getSummary(bestSolution))

but creating that ScoreManager is non-trivial if they are working with the SolverManager. Therefore, add this convenience method: ScoreManager.create(SolverManager)

Reqs: the SolverManager and ScoreManager must be using the same SolverFactory instance afterwards.