Not able to initialize - Blank Screen

Questions
1

I’m not able to initialize F7.I just see a blank screen. Using v6.0.17

My app.js:

var app = new Framework7({
  // App root element
  el: '#app',
  // App Name
  name: 'My App',
  // App id
  id: 'com.myapp.test',
  // Enable swipe panel
  panel: {
    swipe: true,
  },
  // Add default routes
  routes: [
    {
      path: '/about/',
      url: 'about.html',
    },
  ]
  // ... other parameters
});

var mainView = app.views.create('.view-main');

My index.html:

<!DOCTYPE html>
<html>
  <head>
    <!-- Required meta tags-->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no, viewport-fit=cover">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <!-- Color theme for statusbar (Android only) -->
    <meta name="theme-color" content="#2196f3">
    <!-- Your app title -->
    <title>My App</title>
    <!-- Path to Framework7 Library Bundle CSS -->
    <link rel="stylesheet" href="f7/framework7-bundle.min.css">
    <!-- Path to your custom app styles-->
    <link rel="stylesheet" href="css/app.css">
  </head>
  <body>
    <!-- App root element -->
    <div id="app">

      <!-- Your main view, should have "view-main" class -->
      <div class="view view-main">
        <!-- Initial Page, "data-name" contains page name -->
        <div data-name="home" class="page">

          <!-- Top Navbar -->
          <div class="navbar">
            <div class="navbar-bg"></div>
            <div class="navbar-inner">
              <div class="title">Awesome App</div>
            </div>
          </div>

          <!-- Bottom Toolbar -->
          <div class="toolbar toolbar-bottom">
            <div class="toolbar-inner">
              <!-- Toolbar links -->
              <a href="#" class="link">Link 1</a>
              <a href="#" class="link">Link 2</a>
            </div>
          </div>

          <!-- Scrollable page content -->
          <div class="page-content">
            <p>Page content goes here</p>
            <!-- Link to another page -->
            <a href="/about/">About app</a>
          </div>
        </div>
      </div>
    </div>
    <!-- Path to Framework7 Library Bundle JS-->
    <script type="text/javascript" src="f7/framework7-bundle.min.js"></script>
    <!-- Path to your app js-->
    <script type="text/javascript" src="js/app.js"></script>
  </body>
</html>
2

Create new app with Framework7 CLI where everything is set up http://framework7.io/cli/