preparing stock module

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

frontend/src/Components/Menu.svelte

@@ -63,6 +63,7 @@ onMount(fetchModules);
     <a href="/time"     {onclick}>{t('timetracking')}</a>
     <a href="/wiki"     {onclick}>{t('wiki')}</a>
     <a href="/contact"  {onclick}>{t('contacts')}</a>
+    <a href="/stock"    {onclick}>{t('stock')}</a>
     {#if user.id == 2}
     <a href="https://svelte.dev/tutorial/svelte/state" target="_blank">{t('tutorial')}</a>
     {/if}