Contributing to Nixpkgs

1st chunk of `doc/contributing.md`

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# Contributing to Nixpkgs {#part-contributing}

```{=include=} chapters
contributing/quick-start.chapter.md
contributing/coding-conventions.chapter.md
contributing/submitting-changes.chapter.md
contributing/vulnerability-roundup.chapter.md
contributing/reviewing-contributions.chapter.md
contributing/contributing-to-documentation.chapter.md
```

Title: Contributing to Nixpkgs

Summary

This section serves as a guide for contributing to Nixpkgs, encompassing various aspects such as a quick-start guide, coding conventions, the process for submitting changes, managing vulnerabilities, reviewing contributions, and contributing to the documentation.