Simple ChatGPT CLI

I believe many others have implement more sophisticated ChatGPT CLI tool. But this is a super simple one without fancy features that I created with Python for my own use.

My motivation was that using OpenAPI could be much cheaper than subscribing ChatGPT Plus, and _seems_ to be more privacy friendly according to some legal experts.

I'm not planning adding fancy features unless I start to feel some feature would be a big plus to my productivity in my own use case. But everyone are welcomed to use this basic version or fork it to add their own features.