Added base code

flightscore/src/app-root.ts

@@ -0,0 +1,28 @@
+import { LitElement, html } from 'lit';
+import { customElement } from 'lit/decorators.js';
+import './components/nav-bar';
+import { Router } from './router/router';
+import './pages/home-page';
+
+@customElement('app-root')
+export class AppRoot extends LitElement {
+  private router!: Router;
+
+  firstUpdated() {
+    const outlet = this.shadowRoot?.getElementById('outlet') as HTMLElement;
+    this.router = new Router(outlet, [
+      { path: '/', view: () => document.createElement('home-page') },
+      { path: '/tracks', view: () => document.createElement('tracks-page') },
+      { path: '/about', view: () => document.createElement('about-page') },
+    ]);
+    this.router.resolve();
+    this.addEventListener('nav', (e: any) => this.router.navigate(e.detail.path));
+  }
+
+  render() {
+    return html`
+      <nav-bar></nav-bar>
+      <main id="outlet"></main>
+    `;
+  }
+}