Added README.md

_examples/xmpp_pubsub_client/README.md

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+# PubSub client example
+
+## Description
+This is a simple example of a client that :
+* Creates a node on a service
+* Subscribes to that node
+* Publishes to that node
+* Gets the notification from the publication and prints it on screen
+
+## Requirements
+You need to hve running jabber server, like [ejabberd](https://www.ejabberd.im/) that supports [XEP-0060](https://xmpp.org/extensions/xep-0060.html).
+
+## How to use
+Just run : 
+```
+    go run xmpp_ps_client.go
+```