add proxy support

[catmeowjiao]

This Pull request made the following changes:

1. Used the config.json file to add proxy support to the API and GUI.
   By meowjiao
   Using ChatGPT from Chinese translate to English

[catmeowjiao]

i will add proxy support for api, please wait 1~2 days, thanks!

[catmeowjiao]

please edit README.md, thanks!

[catmeowjiao]

please wait, api proxy coming soon

[catmeowjiao]

api proxy is testing

[catmeowjiao]

test done, i'll submit pr, please wait

[catmeowjiao]

ok

[L-Chris]

Not work, Can you give me a json example?

[catmeowjiao]

Not work, Can you give me a json example?

@L-Chris json实例如下：

{
    "proxy": "你的代理地址，如http://127.0.0.1:7890"
}

[piyushpranjal03]

Hey @catmeowjiao,

Thanks for adding the proxy support.
Just wanted to check how this can be used.
I can't find the usage in README file.

This is what I was trying:

response = g4f.ChatCompletion.create(
        model=g4f.models.default,
        provider=You,
        messages=[{"role": "user", "content": content}],
        proxy="http://107.152.47.85:9797",
        timeout=10
)

Can you give me some directions?