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<?php

namespace Drupal\hello_world\Controller;

class HelloWorldController {
    public function hello() {
        return array(
                '#title' => 'Hello World!',
                '#markup' => 'Here is some content.',
            );
    }
}

hello_world:
    path: /hello/world
    defaults:
        _controller: Drupal\hello_world\Controller\HelloWorldController::hello
    requirements:
        _permission: 'access content'

name: Hello World
type: module
description: Say Hello World
package: Custom
core: 8.x