Added a rotating scene

To try

src/objects/ground.js

@@ -0,0 +1,10 @@
+//ground
+import * as THREE from 'three';
+
+export function createGround() {
+  const geometry = new THREE.PlaneGeometry(10, 10);
+  const material = new THREE.MeshBasicMaterial({ color: 0xa3c973 });
+  const plane = new THREE.Mesh(geometry, material);
+
+  return plane;
+}