added router to svelte

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/routes/About.svelte

@@ -0,0 +1 @@
+<h1>About</h1>

frontend/src/routes/Home.svelte

@@ -0,0 +1,5 @@
+<script>
+    import { t } from '../translations.svelte.js';
+    import { user } from '../user.svelte.js';
+</script>
+<h1>{t('home.Welcome',user.name)}</h1>

frontend/src/routes/User.svelte

@@ -0,0 +1,4 @@
+<script>
+    let { id } = $props();
+</script>
+<h1>User {id}</h1>