added create group chat button

src/main/webapp/app.html

@@ -30,6 +30,9 @@
 
             <ul id="userList">
                 <li onclick="openCalculator(); toggleUserList();"><i class="fas fa-user userIcon"></i>Kalkulator</li>
+                <li onclick="openNewGroupChatForm(); toggleUserList();">
+                    <i class="fas fa-user userIcon"></i>Opprett gruppesamtale
+                </li>
             </ul>
 
             <ul id="groupChatList">