Merge pull request #10 from wangkang/main

Enable users to create their own prompts

Add support for custom OpenAI API base URL

Fix brew formula to use tarball and set version

Revert "Add JSON schema for strict message validation"

This reverts commit 5474788.

Prefer saved OpenAI key over environment variable

Resolves #6

Update commit message guidelines in BuildPrompt

Add support for model selection via command line

- Modify `runOptions` to include a `model` field.
- Update `run` function to use the specified model from options.
- Add a new command-line flag for model selection.
- Add relevant environment variable `AICOMMIT_MODEL`.

Resolves #5

Add new guidelines to commit message style rules

Add support for user style guide

- Implement `findUserStyleGuide` to locate `~/COMMITS.md`.
- Adjust `BuildPrompt` to prefer repo style guide, fall back to user style guide.
- Update README with instructions on user style guide.

Resolves #4

Add feature to save OpenAI API key locally

- Extend `README.md` with instructions to save the API key.
- Modify `main.go` to include a `--save-key` flag.
- Implement functions in `savekey.go` for saving/loading the key.