Add installation instruction file;

Order directories.

rivista/xmpp/utilities.py

@@ -0,0 +1,14 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+
+class XmppUtilities:
+
+    def form_a_node_link(pubsub, node):
+        link = 'xmpp:{pubsub}?;node={node}'.format(pubsub=pubsub, node=node)
+        return link
+    
+    def form_an_item_link(pubsub, node, item_id):
+        link = 'xmpp:{pubsub}?;node={node};item={item}'.format(
+            pubsub=pubsub, node=node, item=item_id)
+        return link