Add file PyProject;

Support display of a single pubsub node item;
Update document README;
Modularize code;

jabbercard/xmpp/instance.py

@@ -0,0 +1,22 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+from slixmpp import ClientXMPP
+
+class XmppInstance(ClientXMPP):
+    def __init__(self, jid, password, jid_bare):
+        super().__init__(jid, password)
+
+        self.jid_bare = jid_bare
+
+        self.register_plugin('xep_0030') # XEP-0030: Service Discovery
+        self.register_plugin('xep_0045') # XEP-0045: Multi-User Chat
+        self.register_plugin('xep_0054') # XEP-0054: vcard-temp
+        self.register_plugin('xep_0060') # XEP-0060: Publish-Subscribe
+        self.register_plugin('xep_0369') # XEP-0369: Mediated Information eXchange (MIX)
+
+        self.add_event_handler("session_start", self.on_session_start)
+
+    async def on_session_start(self, event):
+        self.send_presence()
+        #self.disconnect()