First, you need to create a PHP script to define the console application:

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#!/usr/bin/env php
<?php
// application.php

require __DIR__.'/vendor/autoload.php';

use Symfony\Component\Console\Application;

$application = new Application();

// ... register commands

$application->run();

Then, you can register the commands using add():

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// ...
$application->add(new GenerateAdminCommand());

You can also register inline commands and define their behavior thanks to the Command::setCode() method:

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// ...
$application->register('generate-admin')
    ->addArgument('username', InputArgument::REQUIRED)
    ->setCode(function (InputInterface $input, OutputInterface $output): int {
        // ...

        return Command::SUCCESS;
    });

This is useful when creating a single-command application.

See the Console Commands article for information about how to create commands.