chore: add AGENTS.md file (cloudscape-design#411)

Author: amanabiy

AGENTS.md

@@ -0,0 +1,10 @@
+# AGENTS.md
+React component library for the [Cloudscape Design System](https://cloudscape.design/), providing dashboard-oriented board components.
+
+## Setup
+
+This project uses npm.
+
+## Conventions
+
+This repository follows the same conventions as the [main Cloudscape components library](https://github.com/cloudscape-design/components). Refer to the [Cloudscape Components Guide](https://github.com/cloudscape-design/components/blob/main/docs/CLOUDSCAPE_COMPONENTS_GUIDE.md) for details on component structure, props, events, styling, testing, code style, dev pages, and API docs.