Loads args from .evn files some type of config file. 
🚀 Feature / Motivation
I often run my training scripts on different systems with different setups. It would be nice to be able to read args from a configuration file. Like If i on one node have a default directory somewhere other than root, i just put it in the config file. And the trainer loads the args from the file. All i have to do i run python train.py and not python train.py --every-arg-needed etc.
Pitch
Read arguments from a configuration file at startup, possibly a .env file?
Alternatives
Make our own parsers with the same arguments and set defaul=os.getenv("DEFAULT_ROOT") or something. This is what i am doing now.