Add Layout base

src/routes/+layout.svelte

@@ -1,5 +1,11 @@
 <script>
 	import '../app.css';
+	import Header from '../components/Header.svelte';
+	import Footer from '../components/Footer.svelte';
 </script>
 
-<slot />
+<Header />
+<main class="container mx-auto p-6">
+	<slot />
+</main>
+<Footer />