Create AGENTS.md for AI LLM Crawlers

[jamesfredley]

Issue description

See: apache/superset@ff102aa#diff-a54ff182c7e8acf56acfd6e4b9c3ff41e2c41a31c9b211b2deb9df75d9a478f9

[jdaugherty]

We need to review out contributing documents and create LLM agent instructions on how we expect changes to our project to be made, our principles, preferred formatting, project structure, etc

[jamesfredley]

@sanjana2505006

[sanjana2505006]

@jamesfredley Thank you for the mention! I’ll take a look at this and start digging into the contributing docs. Will update once I’ve made some progress.

[sanjana2505006]

@jamesfredley I’ve raised PR #15340 for this. Please let me know if you have any feedback or would like any changes I’d be happy to update it.