adding documentation

documentation/extensions/tokenreconnection.md

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+Token-based reconnection
+========================
+
+Allows to manage communications blocking.
+
+  * Login with token
+  * Get tokens
+  * Get last refresh token from "success" nonza
+  * Avoid reconnection using token
+
+
+**XEP related:** [XEP-xxxx](http://www.xmpp.org/extensions/inbox/token-reconnection.html)
+
+
+Login with token
+----------------
+
+```
+xmppConnection.login(token, resourcepart);
+```
+*token* is a `String`
+
+*resourcepart* is a `Resourcepart`
+
+
+Get tokens
+----------
+
+```
+TBRManager tbrManager = TBRManager.getInstanceFor(xmppConnection);
+TBRTokens tbrTokens = tbrManager.getTokens();
+String accessToken = tbrTokens.getAccessToken();
+String refreshToken = tbrTokens.getRefreshToken();
+```
+
+
+Get last refresh token from "success" nonza
+-------------------------------------------
+
+```
+String refreshToken = xmppConnection.getXOAUTHLastRefreshToken();
+```
+
+
+Avoid reconnection using token
+------------------------------
+
+```
+xmppConnection.avoidTokenReconnection();
+```