added template for subscribing to mail notifications (untested)

template/mail.tpl

@@ -0,0 +1,15 @@
+% rebase('template/wrapper.tpl')
+
+<%
+import markdown as md
+
+html = md.markdown(markdown)
+%>
+
+<form action="/city/mail/<% print(city) %>" method="post">
+    <input type="text" name="mailaddress" placeholder="E-Mail address" id="mailaddress">
+    <input name='confirm' value='Subscribe to E-Mail notifications' type='submit'/>
+</form>
+
+
+{{!html}}