chore(docs): added AGENTS.MD

[hawkaii]

What this PR does / why we need it:
adds AGENTS.MD file for AI-assisted development

Fixes #86

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

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[kramaranya]

Thank you @hawkaii for working on this!

Could we provide more information in this doc to align with other examples?
For example, pipelines have a good content https://github.com/kubeflow/pipelines/blob/master/AGENTS.md
Also kubernetes https://github.com/kubernetes/kubernetes/blob/1f98145048835b8a9fd6ec9d769f57fc548c8304/AGENTS.md
I personally like what langchain has https://github.com/langchain-ai/langchain/blob/master/AGENTS.md