title: How to show a loading indicator when loading the app at the first time
body: <p>I have to load many files for my AngularJs single page application, like angular.js, jquery.js, bootstrap.js, bootstrap.css, some_plugins.js, my_main.js and others,</p>
  
  <p>It take some time to load the entire app, so I want to show a loading indicator (a spinner for example) in a void page until all the js and css files load and then display the content.</p>