Add AGENTS.md (#41)

Signed-off-by: Tamal Saha <tamal@appscode.com>

Author: tamalsaha

AGENTS.md

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+# AGENTS.md
+
+This file provides guidance to coding agents (e.g. Claude Code, claude.ai/code) when working with code in this repository.
+
+## Repository purpose
+
+`@bytebuilders/deploy-button` — an embeddable JavaScript widget that renders a "Deploy to ByteBuilders" button on third-party sites (vendor catalogs, docs, demos). Clicking it opens a modal that hands the user off to the ByteBuilders console with the chart/source pre-filled. Built with webpack and shipped as a minified bundle under `dist/`.
+
+## Architecture
+
+- `src/` — widget source (the `DeployButton` class, modal logic, styles).
+- `modal.html` — modal template.
+- `public/` — static assets.
+- `dist/` — built bundle (committed for direct CDN consumption).
+- `webpack.config.js` — bundler config.
+- `package.json` — npm scripts and dependencies.
+
+## Common commands
+
+- `npm install` — install dependencies.
+- `npm run build` — webpack production build → `dist/`.
+- (No tests configured.)
+
+## Conventions
+
+- This is an **embeddable widget**, not a SPA. Keep the bundle small and self-contained.
+- The bundle is checked into `dist/` so third parties can consume it directly from GitHub; rebuild + commit `dist/` when changing `src/`.
+- Don't introduce global state that conflicts with the host page.
+- License: see `LICENSE` if present.