title: How to add meta in nuxt router?
body: <p>In vue, we defined meta like this:</p>
  
  <pre><code>const router = new VueRouter({
    routes: [
      {
        path: '/foo',
        component: Foo,
        children: [
          {
            path: 'bar',
            component: Bar,
            // a meta field
            meta: { requiresAuth: true }
          }
        ]
      }
    ]
  })
  </code></pre>
  
  <p>But how do we define meta in nuxt?</p>