Added examples, tweaked print job

examples/simple.php

@@ -0,0 +1,13 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Lpr\PrintJob;
+
+$job = new PrintJob("image.png");
+
+// Configure
+$job->setPrinter("PDF");
+
+// Invoke lpr to print the image
+$job->submit();