App.html
<template>
  <h1>${message}</h1>
  <h2>Routes here</h2>
  <router-view></router-view>
</template>

app.js
export class App {
  constructor() {
    this.message = 'Hello World!';
  }

   configureRouter(config, router) {
    this.router = router;
    config.title = 'Aurelia';
    config.map([
      { route: 'school',            name: 'school',      moduleId: 'school',   nav: true }
    ]);
  }
}