[Feature Request] Per-project configuration

[pwwang]

Now, gptcommit uses a global configuration, including API keys, prompts, etc. Is it possible to have per-project configurations?

For example, with a per-project prompt, I can have only titles for some projects, or I can add some specific characters in the messages, for example, some emojis.

One solution I can think of is to have a configuration file ./.gptcommit/config.toml, which overwrites the global one.

It is also helpful for us to use different API keys and track their usage for different projects.

[zurawiki]

Solving this in #54

[zurawiki]

Fixed in v0.1.17. See README or executable's help for usage of the gptcommit config --local flag