Add initial header comments

[Peetwa]

Steps: Write comments for...

• [ ] Constants.lua

• [ ] Fitness.lua

• [ ] Forms.lua

• [ ] Inputs.lua

• [ ] MarioAI.lua

• [ ] Mutations.lua

• [ ] NeuralNetwork.lua

• [ ] Pools.lua

• [ ] SaveStates.lua

• [ ] Timeout.lua