Just finished constructing airplane models

[Diao Zihao]

This issue is informative.

I finished my first part of work of modeling the airplanes. All the code is in the directory airplane_models. To use it, just import using from airplane_models.airplane import genericAirplane and use this class to construct an airplane in the environment.

Also, check the code to see how it works and if the implementation is feasible. Documentation is on the way.