add RSS feed to events index

app/views/api/events/index.rss.builder

@@ -0,0 +1,21 @@
+#encoding: UTF-8
+
+xml.instruct! :xml, version: "1.0"
+xml.rss version: "2.0" do
+  xml.channel do
+    xml.title "#{t('app.public.events_list.the_fablab_s_courses_and_workshops')} - #{Setting.find_by(name: 'fablab_name').value}"
+    xml.author Setting.find_by(name: 'fablab_name').value
+    xml.link request.base_url + "/#!/events"
+    xml.language I18n.locale.to_s
+
+    @events.each do |event|
+      xml.item do
+        xml.guid event.id
+        xml.pubDate event.created_at.strftime("%F %T")
+        xml.title event.name
+        xml.link request.base_url + "/#!/events/" + event.id.to_s
+        xml.description event.description
+      end
+    end
+  end
+end