Examples: Added README.md for light shafts demo

examples/models/gltf/Tree/README.md

@@ -0,0 +1,5 @@
+# Low Poly Foliage Test
+
+Model by [Splodeman](https://sketchfab.com/3d-models/low-poly-foliage-test-c1ce9830c6af4b5289ee9ecb3c30512f).
+
+The model is license under Creative Commons Attribution.

examples/webgl_lightshafts.html

@@ -179,7 +179,7 @@
 
 				// model
 
-				var loader = new THREE.GLTFLoader().setPath( 'models/gltf/' );
+				var loader = new THREE.GLTFLoader().setPath( 'models/gltf/Tree/' );
 				loader.load( 'tree.glb', function ( gltf ) {
 
 					gltf.scene.traverse( function ( child ) {