Completely Fair Scheduler and Staircase Scheduler

A simple implementation of the commonly used CFS and Staircase scheduler algorithms in some Operating Systems like Linux.

For more information on the algorithms:
Staircase Scheduler: https://lwn.net/Articles/87729/
Completely Fair Scheduler: https://www.geeksforgeeks.org/completely-fair-scheduler-cfs-and-brain-fuck-scheduler-bfs/

Related algorithms: https://lwn.net/Articles/224865/