GeezerVison

This pull request includes several updates to improve the functionality and user experience of the magicc CLI tool. The most important changes include the introduction of validation for the OpenAI API key, updates to the default model used for generating commit messages, and enhancements to the setup process.

API Key Validation:

• source/utils/api.js: Added a function to validate the OpenAI API key by making a request to the OpenAI API and handling various response statuses.

Default Model and Configuration Updates:

• source/utils/config.json: Updated configuration to include a new default model gpt-4o-mini, set a maximum diff size, and revised instructions for commit message categories.
• source/utils/openai.js: Modified functions to use the new default model from the configuration and added logic to handle large diff sizes. [1] [2]

Setup and Installation:

• contributing.md: Added setup instructions for installing the CLI app using yarn or npm, and noted the requirement for a Linux-based OS.
• package.json: Added new scripts for setup and reset commands, specifically for Ubuntu.

Miscellaneous Improvements:

• .npmrc: Added engine-strict-true to enforce strict engine compatibility.
• README.md: Updated the description to mention the use of gpt-4o-mini as the default model for generating commit messages.
• source/utils/commit.js: Changed the default answer for commit message confirmation to "N" for better user experience.

These changes collectively enhance the robustness and usability of the magicc tool, ensuring better validation, configuration flexibility, and ease of setup.