Remove PayloadInterface, add README

examples/basic_example.php

@@ -4,12 +4,8 @@ use JoopSchilder\React\Stream\NonBlockingInput\ReadableNonBlockingInputStream;
 use React\EventLoop\Factory;
 
 require_once __DIR__ . '/../vendor/autoload.php';
-require_once __DIR__ . '/basic_example_classes.php';
+require_once __DIR__ . '/demo_classes.php';
 
-/**
- * The input will have data available every second.
- * After 4 seconds have passed, it will generate an error.
- */
 $input = new DemoNonBlockingInput();
 
 $loop = Factory::create();
@@ -19,4 +15,3 @@ $stream->on('error', fn() => print('e'));
 $stream->on('close', fn() => print('c'));
 $loop->addPeriodicTimer(0.2, fn() => print('.'));
 $loop->run();
-