Added example about connecting with auth and pass

Author: repejota

examples/connectauth.php

@@ -0,0 +1,12 @@
+<?php
+require_once __DIR__ . "/../vendor/autoload.php";
+
+$connectionOptions = new \Nats\ConnectionOptions();
+$connectionOptions
+    ->setHost('localhost')
+    ->setPort(4222)
+    ->setUser("foo")
+    ->setPass("bar");
+$c = new Nats\Connection($connectionOptions);
+$c->connect();
+$c->close();