Merge pull request #3521 from TrevorDev/updateReadmeWithUsage

Add usage to github README.md

readme.md

@@ -57,6 +57,45 @@ If using TypeScript, don't forget to add 'babylonjs' to 'types' in tsconfig.json
 
 To add a module install the respected package. A list of extra packages and their installation instructions can be found on [babylonjs' user at npm](https://www.npmjs.com/~babylonjs).
 
+## Usage
+See [Getting Started](http://doc.babylonjs.com/#getting-started)
+```javascript
+// get the canvas DOM element
+var canvas = document.getElementById('renderCanvas');
+// load the 3D engine
+var engine = new BABYLON.Engine(canvas, true);
+// createScene function that creates and return the scene
+var createScene = function(){
+    // create a basic BJS Scene object
+    var scene = new BABYLON.Scene(engine);
+    // create a FreeCamera, and set its position to (x:0, y:5, z:-10)
+    var camera = new BABYLON.FreeCamera('camera1', new BABYLON.Vector3(0, 5,-10), scene);
+    // target the camera to scene origin
+    camera.setTarget(BABYLON.Vector3.Zero());
+    // attach the camera to the canvas
+    camera.attachControl(canvas, false);
+    // create a basic light, aiming 0,1,0 - meaning, to the sky
+    var light = new BABYLON.HemisphericLight('light1', new BABYLON.Vector3(0,1,0), scene);
+    // create a built-in "sphere" shape; its constructor takes 5 params: name, width, depth, subdivisions, scene
+    var sphere = BABYLON.Mesh.CreateSphere('sphere1', 16, 2, scene);
+    // move the sphere upward 1/2 of its height
+    sphere.position.y = 1;
+    // create a built-in "ground" shape; its constructor takes the same 5 params as the sphere's one
+    var ground = BABYLON.Mesh.CreateGround('ground1', 6, 6, 2, scene);
+    // return the created scene
+    return scene;
+}
+// call the createScene function
+var scene = createScene();
+// run the render loop
+engine.runRenderLoop(function(){
+    scene.render();
+});
+// the canvas/window resize event handler
+window.addEventListener('resize', function(){
+    engine.resize();
+});
+```
 ## Preview release
 
 Preview version of **3.2** can be found [here](https://github.com/BabylonJS/Babylon.js/tree/master/dist/preview%20release).