added router to svelte

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

frontend/src/Components/Menu.svelte

@@ -1,15 +1,24 @@
 <script>
+    import { useTinyRouter } from 'svelte-tiny-router';
     import { t } from '../translations.svelte.js';
     import { user } from '../user.svelte.js';
 
+    const router = useTinyRouter();
+
+    function gotoAbout(){
+        router.navigate('/about');
+    }
+
     function logout(){
         user.name = null;
     }
 </script>
 <nav>
-    <a href="/">{t('nav.Home')}</a>
+    <a on:click={() => router.navigate('/')}>{t('nav.Home')}</a>
+    <a on:click={gotoAbout}>{t('nav.About')}</a>
+    <a on:click={() => router.navigate('/user/5')}>{t('nav.User5')}</a>
     <a href="https://svelte.dev/tutorial/svelte/state" target="_blank">{t('nav.Tutorial')}</a>
     {#if user.name }
-    <a href="#" on:click={logout}>Logout</a>
+    <a on:click={logout}>Logout</a>
     {/if}
 </nav>