Further work on note ownership and sharing

internal/conf/templates/view.tmpl.html

@@ -7,6 +7,26 @@
     <a class="btn btn-primary" href="{{.urlEdit}}">Edit</a>
     <a class="btn btn-danger" href="{{.urlDelete}}">Delete</a>
 </div>
+<div class="mt-2">
+    <h3>Ownership</h3>
+    {{if .note.Viewers}}
+    <p>This note is owned by <em>{{.note.Owner}}</em> and is further visible to</p>
+    <ul>
+        {{range .viewers}}
+            <li>{{.}}</li>
+        {{end}}
+    </ul>
+    {{else}}
+    <p>This note is owned by <em>{{.note.Owner}}</em>.</p>
+    {{end}}
+
+    <form action="{{.urlShare}}" method="POST">
+    <div class="mb-3">
+        <input type="text" class="form-control" id="viewerInput" name="viewer" aria-described-by="viewerHelp" />
+        <div id="viewerHelp" class="form-text">Share with other user</div>
+    </div>
+    <button class="btn btn-primary" type="submit">Share</button>
+</div>
 
 <script>
     let checkBoxes = document.querySelectorAll('input[type=checkbox]')