docs: add CONTRIBUTING.md and document updater EXE usage

[hieuck]

Summary\r\nImprove contributor and user documentation.\r\n\r\n## Changes\r\n- Add with the bug/feature workflow, worktree conventions, test requirements, and conventional commit guidance.\r\n- Update with an section explaining how works and why it is needed.\r\n\r\nCloses #43. Closes #44.

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📥 Commits

Reviewing files that changed from the base of the PR and between 57b6dd3 and eea31a7.

📒 Files selected for processing (2)

• CONTRIBUTING.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/docs-contributing-readme

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