Gym-pysc2 Benchmark

In this report, we hope to provide a preliminary benchmark on pysc2's environments. See DeepMind's paper (https://arxiv.org/pdf/1708.04782.pdf) for more details on these environments. See https://github.com/vwxyzjn/gym-pysc2 for the source code. We now present our benchmark on some popular tasks in pysc2 such as Mining resources, producing marines, defeating roaches, etc