add di, factory, serializer aware, readme

readme.md

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+## Usage
+
+```php
+use WebChemistry\FormSerializer\FormSerializerAwareInterface;
+use WebChemistry\FormSerializer\TFormSerializer;
+
+class Form extends NetteForm implements FormSerializerAwareInterface {
+
+	use TFormSerializer;
+
+}
+```
+
+```php
+
+use Nette\Application\UI\Form;
+use WebChemistry\FormSerializer\FormSerializerFactoryInterface;
+
+class ArticleForm {
+
+	public function __construct(private FormSerializerFactoryInterface $formSerializerFactory) {}
+
+	public function create() {
+		$serializer = $this->formSerializerFactory->create($form = new Form(), Article::class);
+
+		return $form;
+	}
+
+}
+
+```

src/DI/FormSerializerExtension.php

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+<?php declare(strict_types = 1);
+
+namespace WebChemistry\FormSerializer\DI;
+
+use Nette\DI\CompilerExtension;
+use WebChemistry\FormSerializer\FormSerializerFactory;
+use WebChemistry\FormSerializer\FormSerializerFactoryInterface;
+
+final class FormSerializerExtension extends CompilerExtension
+{
+
+	public function loadConfiguration(): void
+	{
+		$builder = $this->getContainerBuilder();
+
+		$builder->addDefinition($this->prefix('factory'))
+			->setType(FormSerializerFactoryInterface::class)
+			->setFactory(FormSerializerFactory::class);
+	}
+
+}

src/FormSerializerAwareInterface.php

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+<?php declare(strict_types = 1);
+
+namespace WebChemistry\FormSerializer;
+
+interface FormSerializerAwareInterface
+{
+
+	public function setSerializer(FormSerializer $serializer);
+
+}

src/FormSerializerFactory.php

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+<?php declare(strict_types = 1);
+
+namespace WebChemistry\FormSerializer;
+
+use Doctrine\ORM\EntityManagerInterface;
+use Nette\Application\UI\Form;
+use Symfony\Component\Serializer\Serializer;
+
+final class FormSerializerFactory implements FormSerializerFactoryInterface
+{
+
+	public function __construct(
+		private Serializer $serializer,
+		private EntityManagerInterface $em,
+	)
+	{
+	}
+
+	public function create(Form $form, string $class): FormSerializer
+	{
+		$serializer = new FormSerializer($form, $class, $this->serializer, $this->em);
+
+		if ($form instanceof FormSerializerAwareInterface) {
+			$form->setSerializer($serializer);
+		}
+
+		return $serializer;
+	}
+
+}

src/FormSerializerFactoryInterface.php

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+<?php declare(strict_types = 1);
+
+namespace WebChemistry\FormSerializer;
+
+use Nette\Application\UI\Form;
+
+interface FormSerializerFactoryInterface
+{
+
+	public function create(Form $form, string $class): FormSerializer;
+
+}

src/TFormSerializer.php

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+<?php declare(strict_types = 1);
+
+namespace WebChemistry\FormSerializer;
+
+trait TFormSerializer
+{
+
+	private FormSerializer $serializer;
+
+	/**
+	 * @return static
+	 */
+	public function setSerializer(FormSerializer $serializer)
+	{
+		$this->serializer = $serializer;
+
+		return $this;
+	}
+
+	public function getSerializer(): FormSerializer
+	{
+		return $this->serializer;
+	}
+
+}