Secure API Key storage

[miron]

• getpass (Python Standard Library) https://docs.python.org/3/library/getpass.html
• cryptography https://pypi.org/project/cryptography/ already dependency of python-binance
• passlib https://passlib.readthedocs.io/en/stable/
• as json, i.e. atapi.json:

  {"key" : "your_api_key","secret":"your_secret_key"}

• export as environment variables:

  export BINANCE_API_KEY=<your_api_key>
  export BINANCE_API_SECRET=<your_secret_key>

• python-dotenv standard for Flask, don't see the point atm, as all it does is reading an .env file and setting it as environment variables?
• python-decouple, same, from Django