Mention AGENTS.md?

[karlhorky]

Hi @addyosmani, thanks for this guide, looks great!

I saw the content about GEMINI.md, and I wanted to ask if you'd be open to mentioning AGENTS.md, given that this is a standard with support across a few tools in the AI CLI ecosystem.

Also mentioned briefly in the Gemini CLI docs:

• https://geminicli.com/docs/cli/configuration/#available-settings-in-settingsjson