Add details for calendar

index.html

@@ -28,6 +28,8 @@
 
         <div class="tool">
             <a class="box btn" target="_blank" href="https://fachschaft.cl.uni-heidelberg.de/docs/Kalender"><i class="fa-regular fa-calendar-days"></i> Kalender</a>
+            <span class="detail"><i class="fa-solid fa-user-plus"></i> Spezieller Account</span>
+            <span class="detail"><i class="fa-regular fa-handshake"></i> Einladung nötig</span>
         </div>
     </main>
 </body>