Add Competition Rules

[rallen10]

There are some competition rules that can be partially enforced in software but are also partially reliant on the "honor code" for participants. Therefore it is necessary to document these rules. For example:

• Do not alter the evaluation metrics of your agents or falsify the reported metrics
• Do not attempt to take control of another spacecraft within the KSP game engine (i.e. change active vessel) unless that is explicitly part of the environment's action space