Add Composer autoloading functions and PHPStan for testing

vendor/nette/bootstrap/readme.md

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+Nette Bootstrap
+===============
+
+[![Downloads this Month](https://img.shields.io/packagist/dm/nette/bootstrap.svg)](https://packagist.org/packages/nette/bootstrap)
+[![Build Status](https://travis-ci.org/nette/bootstrap.svg?branch=master)](https://travis-ci.org/nette/bootstrap)
+[![Coverage Status](https://coveralls.io/repos/github/nette/bootstrap/badge.svg?branch=master)](https://coveralls.io/github/nette/bootstrap?branch=master)
+[![Latest Stable Version](https://poser.pugx.org/nette/bootstrap/v/stable)](https://github.com/nette/bootstrap/releases)
+[![License](https://img.shields.io/badge/license-New%20BSD-blue.svg)](https://github.com/nette/bootstrap/blob/master/license.md)
+
+File `bootstrap.php` loads Nette Framework and all libraries that we depend on:
+
+```php
+require __DIR__ . '/../vendor/autoload.php';
+```
+
+Class `Configurator` creates so called DI container and handles application initialization.
+
+```php
+$configurator = new Nette\Configurator;
+```
+
+Activates Tracy in strict mode:
+
+```php
+//$configurator->setDebugMode(true);
+$configurator->enableTracy(__DIR__ . '/../log');
+```
+
+Setup directory for temporary files
+
+```php
+$configurator->setTempDirectory(__DIR__ . '/../temp');
+```
+
+Activate [autoloading](https://doc.nette.org/en/auto-loading#toc-nette-loaders-robotloader), that will automatically load all the files with our classes:
+
+```php
+$configurator->createRobotLoader()
+	->addDirectory(__DIR__)
+	->addDirectory(__DIR__ . '/../vendor/others')
+	->register();
+```
+
+And according to the configuration files it generates a DI container. Everything else depends on it.
+
+We will return this DI Container as a result of calling `app/boostrap.php`
+
+```php
+$configurator->addConfig(__DIR__ . '/config/config.neon');
+$configurator->addConfig(__DIR__ . '/config/config.local.neon');
+return $configurator->createContainer();
+```
+
+and we will store it as local variable in `www/index.php` and run the application:
+
+```php
+$container = require __DIR__ . '/../app/bootstrap.php';
+$container->getService('application')->run();
+```
+
+That's it.