Add comments in the code

src/example/philosophes/MainPhilosophe.java

src/example/philosophes/Philosopher.java

src/mas/core/Agent.java

src/mas/core/Cyclable.java

src/mas/core/Schedulable.java

src/mas/core/ThreeStepCyclable.java

src/mas/core/TwoStepCyclable.java

src/mas/environment/TwoDContinuosGrid.java

src/mas/implementation/schedulers/AsyncCycling.java

src/mas/implementation/schedulers/FairCycling.java

src/mas/implementation/schedulers/FairPosCycling.java