Remove PayloadInterface, add README

examples/jokes_example.php

@@ -0,0 +1,16 @@
+<?php
+
+use JoopSchilder\React\Stream\NonBlockingInput\ReadableNonBlockingInputStream;
+use React\EventLoop\Factory;
+
+require_once __DIR__ . '/../vendor/autoload.php';
+require_once __DIR__ . '/demo_classes.php';
+
+$input = new DemoJokeGenerator();
+
+$loop = Factory::create();
+$stream = new ReadableNonBlockingInputStream($input, $loop);
+$stream->on('data', fn(Joke $joke) => print($joke . PHP_EOL));
+$loop->addPeriodicTimer(0.2, fn() => print('.' . PHP_EOL));
+$loop->run();
+