made basic message passing setup

src/main.ts

@@ -0,0 +1,12 @@
+import './style.css'
+import { attachCanvas, connectWorker } from "../core/connection/mainThread.ts";
+import MainSceneWorker from "../examples/starterScene?worker";
+
+document.querySelector<HTMLDivElement>('#app')!.innerHTML = `
+  <canvas id="rendering-canvas">
+  </canvas>
+`
+
+const mainSceneWorker = new MainSceneWorker();
+connectWorker(mainSceneWorker);
+attachCanvas(mainSceneWorker, "rendering-canvas");