tahongshen add something below
1.change the content of README.md, show some env setup and install steps
2.add a new routes '/index' in file routes.php
3.modify the login view and login layout
4.modify something on the register view and register layout
5.modify the header element
6.modify style.css and add '#notification' to the style.css
7.add a error.css includes the css coming from cake.generic.css