Updated the readme to include the apple-touch-icon and assets folder

Updated the `README.md` to inlcude the apple-touch-icon-precomposed.png and the new assets folder from #8:

````
├── app
│   ├── apple-touch-icon-precomposed.png
│   ├── assets
│   │   ├── css
│   │   ├── fonts
│   │   ├── img
│   │   └── js
│   ├── favicon.ico
│   └── index.html
```