Add README

README.md

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+# effect-godot (monorepo)
+
+Bun workspace monorepo.
+
+```
+packages/
+  effect-godot/   the library — see packages/effect-godot/README.md
+  game/           example Godot project consuming it
+  godot-bin/      CLI (`godot-bin`) for fetching/running the pinned GodotJS engine build
+```
+
+## Quickstart
+
+```sh
+bun install
+bun run --cwd packages/game godot:fetch   # downloads the GodotJS engine build pinned in packages/game/godot.config.json
+bun run --cwd packages/game build         # bundles packages/game/src/**/*.ts to CJS via rolldown
+bun run --cwd packages/game edit          # opens the project in the Godot editor
+```