Add AGENTS.md (#215)

Author: huntie

AGENTS.md

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+# Project Instructions
+
+This codebase is a fork of https://github.com/ChromeDevTools/devtools-frontend.
+
+## Editing Policy
+
+- Make minimal edits. No speculative refactors.
+- Changes should generally be scoped to the `front_end/` directory. Focus code searches here.
+
+## Workflow
+
+- Update `BUILD.gn` files when adding new modules and imports.
+- New files should prepend "Copyright (c) Meta Platforms, Inc. and affiliates." as the first line of the license header, above the Chromium Authors license. Keep in sync with `META_CODE_PATHS` in `scripts/eslint_rules/lib/check-license-header.js`.
+
+## Architecture
+
+- For UI code, prefer modern `html` template code and locate styles in one adjacent CSS file. Example: `front_end/ui/components/cards/Cards.ts`.