[wp-trac] [WordPress Trac] #63901: Add `AGENTS.md` for the project

[WordPress Trac]

#63901: Add `AGENTS.md` for the project
------------------------------+------------------------------
 Reporter:  flixos90          |       Owner:  (none)
     Type:  enhancement       |      Status:  new
 Priority:  normal            |   Milestone:  Awaiting Review
Component:  Build/Test Tools  |     Version:
 Severity:  normal            |  Resolution:
 Keywords:                    |     Focuses:
------------------------------+------------------------------

Comment (by flixos90):

 Here's a proposal for a high-level outline we could start with:

 1. **Project brief**: Describes what the project / repository is and does
 in 1-2 short paragraphs.
 2. **High-level architecture**: Outlines a few key concepts, design
 patterns, and philosophies for the project's architecture, potentially
 including a few sub sections. Could also cover aspects like directory
 structure.
 3. **Development tooling and commands**: Lists the most commonly useful
 development tooling and relevant commands, such as `composer lint` or `npm
 run test:php`.
 4. **Coding standards and best practices**: Clarifies coding standards and
 related best practices to follow, e.g. naming conventions, documentation
 guidelines etc.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63901#comment:1>
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