feat(install-extended): add bun package manager support

[ioncakephper]

Add CONTRIBUTING.md and RULES_OF_CONDUCT.md.
Enhance README.md with sections on project purpose, transform options, helper scripts, contributing, and license. Update transform keyword in README example.

[gemini-code-assist]

Summary of Changes

Hello @ioncakephper, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces support for the Bun package manager within the markdown-magic-install-extended utility, enabling it to generate installation instructions for Bun. Alongside this functional enhancement, the project's documentation and community governance have been substantially improved through the addition of contribution guidelines, a code of conduct, and a comprehensive overhaul of the README.md file to better inform users and contributors.

Highlights

• Bun Package Manager Support: The markdown-magic-install-extended transform now includes support for the Bun package manager, allowing it to generate bun install commands in documentation.
• Enhanced Project Documentation: New CONTRIBUTING.md and RULES_OF_CONDUCT.md files have been added to provide clear guidelines for community contributions and behavior, fostering a more structured and welcoming environment.
• Comprehensive README.md Overhaul: The README.md has been significantly updated with new sections explaining the project's purpose, detailing transform options (including the new bun option), outlining helper scripts, and providing dedicated contribution and licensing information.

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[gemini-code-assist]

Code Review

This pull request successfully adds support for the bun package manager and enhances the project's documentation by adding CONTRIBUTING.md, RULES_OF_CONDUCT.md, and significantly improving the README.md. The changes are well-structured, but I've identified a couple of issues: an incorrect command is generated for bun, and there's a minor inconsistency in the README.md documentation. My review includes suggestions to fix these points.