Add requirements.txt or alternative

[filipre]

Hi!
Currently, I try to get this project running. However, the README does not exactly describe which requirements are necessary and issues like #29 arise. It would be useful for me and others, if there is a requirements.txt or maybe even a Dockerfile in order to get this running on any platform.
Cheers
René

EDIT:
For me following requirements.txt work:

atari-py==0.0.21
Box2D-kengz==2.3.3
certifi==2017.7.27.1
chardet==3.0.4
funcsigs==1.0.2
gym==0.7.0
idna==2.6
imageio==2.2.0
Keras==2.0.8
mock==2.0.0
mujoco-py==0.5.7
numpy==1.13.3
olefile==0.44
pachi-py==0.0.21
pbr==3.1.1
Pillow==4.3.0
protobuf==3.1.0
pyglet==1.2.4
PyOpenGL==3.1.0
PyYAML==3.12
requests==2.18.4
scipy==1.0.0
six==1.11.0
tensorflow==0.12.0
Theano==0.9.0
tqdm==4.19.4
urllib3==1.22

In addition I had to run following commands:

brew install swig
brew install cmake

the simulator should look for you like this:

[filipre]

#35 related

[DuWeiQiang]

thank you so much. very helpful