implemented storing of bookmarks

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

frontend/src/routes/bookmark/Index.svelte

@@ -0,0 +1,43 @@
+<script>
+    import { api } from '../../urls.svelte.js';
+    import { t }   from '../../translations.svelte.js';
+
+    import Editor from '../../Components/MarkdownEditor.svelte';
+
+    let comment = $state({source:null,rendered:null});
+    let error   = $state(null);
+    let link    = $state(null);
+
+    async function onclick(ev){
+        let data    = {
+            url     : link,
+            comment : comment.source
+        };
+        const url  = api('bookmark/save');
+        const resp = await fetch(url,{
+            credentials : 'include',
+            method      : 'POST',
+            body       : JSON.stringify(data)
+        });
+        if (resp.ok) {
+        } else {
+            error = await resp.text();
+        }
+    }
+</script>
+
+<fieldset>
+    <legend>{t('Bookmarks')}</legend>
+    {#if error}
+    <span class="error">{error}</span>
+    {/if}
+    <label>
+        {t('URL')}
+        <input bind:value={link} />
+    </label>
+    <label>
+        {t('Comment')}
+        <Editor simple={true} bind:value={comment} />
+    </label>
+    <button {onclick}>{t('save')}</button>
+</fieldset>