Add AGENT.md

Author: frostyplanet

AGENT.md

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+# General
+- All comment and document must be in English.
+- Omit unnecessary obvious comment during coding.
+- For the document, must be concise, well organize into catelog, no duplicated topic, no redundant information. Relative topic should be organize in near position.
+- If you don't know 3rd-party API, should lookup on `https://docs.rs/<crate>`.
+- Do not run cargo clippy
+- Run test with `make test`. In order to prevent too long output truncated by AI tool, run test with `make test <test_name>` when you have a targeted test case.
+- Always use shorter token path by importing the trait or structure.
+
+# Execution plan
+
+Create execution plan with steps when going large design, store into `docs/(topic)_steps.md`, wait for review.