Add README.md

README.md

+## Welcome to python-nbxmpp website
+
+python-nbxmpp is a Python library that provides a way for Python applications to use Jabber/XMPP networks in a non-blocking way. This library is initialy a fork of xmpppy one, but using non-blocking sockets.
+
+## Features
+
+ * Asynchronous
+ * Supports ANONYMOUS, EXTERNAL, GSSAPI, SCRAM-SHA-1, DIGEST-MD5, PLAIN, and X-MESSENGER-OAUTH2 authentication mechanisms.
+ * Supports connection via proxies
+ * Suppors TLS
+ * Supports [BOSH (XEP-0124)](https://xmpp.org/extensions/xep-0124.html)
+ * Support [Stream Managemen (XEP-0198)](https://xmpp.org/extensions/xep-0198.html)
+
+## Starting Points
+
+ * [Downloads](/tags)
+ * You can also clone the git repository at http://gitlab.gajim.org/gajim/python-nbxmpp.git
+ * [Example](/tree/master/doc/examples)
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