message: add camera component example
diff: @@ -4,10 +4,16 @@ import { storiesOf } from "@storybook/react";
  import Viewer from "../Viewer";
  import CameraFlyTo from "../CameraFlyTo";
  +import Camera from "../Camera";
  export default () => {
  storiesOf("Camera", module).addWithJSX("default", () => (
  <Viewer full>
  + <Camera
  + onMoveEnd={e => console.log("end", e)}
  + onMoveStart={e => console.log("start", e)}
  + onChanged={e => console.log("changed", e)}
  + />
  <CameraFlyTo duration={5} destination={Cartesian3.fromDegrees(139.767052, 35.681167, 100)} />
  </Viewer>
  ));
  