Implement Unit Tests, add Readme, add examples, stronger implementation

bin/example_with_job_class.php

@@ -0,0 +1,35 @@
+<?php
+
+use Toalett\Multiprocessing\ConcurrencyLimit;
+use Toalett\Multiprocessing\ContextBuilder;
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+class Job
+{
+	private string $title;
+
+	public function __construct(string $title)
+	{
+		$this->title = $title;
+	}
+
+	public function __invoke()
+	{
+		cli_set_process_title('php ' . $this->title);
+		print("start:{$this->title}\n");
+		sleep(3);
+		print("stop :{$this->title}\n");
+	}
+}
+
+$limit = ConcurrencyLimit::singleWorker();
+$context = ContextBuilder::create()->withLimit($limit)->build();
+
+for ($i = 0; $i < 3; $i++) {
+	$title = md5(mt_rand());
+	$context->submit(new Job($title));
+}
+
+$context->on('no_workers_remaining', fn() => $context->stop());
+$context->run();