added admin menu link

cash/templates/cash/base.html

@@ -96,6 +96,10 @@ DEVELOPMENT
 			<div class="menulink"><a class="menulink" href="/">Übersicht</a></div>
 			<div class="menulink"><a class="menulink" href="{% url 'products' %}">Kaufen</a></div>
 			<div class="menulink"><a class="menulink" href="{% url 'transactions' %}">Kontoauszug</a></div>
+			{% if user.is_staff %}
+			<span class="small-gray">Administration</span><br/>
+			<div class="menulink"><a class="menulink" href="/admin/">Administration</a></div>
+			{% endif %}
 			{% else %}
 			Einloggen um Menüfunktionen zu benutzen.
 			{% endif %}