feat: Add new examples

resources/examples/signed/sign.md

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+# How to sign a PDF
+
+generate certificate:
+- gpgsm --generate-key (RSA, subject name CN=Florian Moser, self-signed yes)
+- gpgsm --import, then paste the certificate followed by CTRL+D
+- gpgsm --fingerprint, the copy ID field (e.g. `0x9C1A23DA`)
+
+apply certificate:
+- pdfsig signature.pdf signature_signed.pdf -add-signature -backend GPG -nick 0x9C1A23DA
+
+review of other tools:
+- not supported by pdftk, qpdf
+- open-pdf-sign bad wrapper around Java PDFBox

resources/examples/signed/signature.php

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+<?php
+
+/*
+ * This file is part of the famoser/pdf-generator project.
+ *
+ * (c) Florian Moser <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+include '../vendor/autoload.php';
+
+use Famoser\PdfGenerator\Frontend\Content\Paragraph;
+use Famoser\PdfGenerator\Frontend\Content\Style\DrawingStyle;
+use Famoser\PdfGenerator\Frontend\Content\Style\TextStyle;
+use Famoser\PdfGenerator\Frontend\Layout\ContentBlock;
+use Famoser\PdfGenerator\Frontend\Layout\Flow;
+use Famoser\PdfGenerator\Frontend\Layout\Parts\Row;
+use Famoser\PdfGenerator\Frontend\Layout\Style\ColumnSize;
+use Famoser\PdfGenerator\Frontend\Layout\Table;
+use Famoser\PdfGenerator\Frontend\LinearDocument;
+use Famoser\PdfGenerator\Frontend\Resource\Font;
+use Famoser\PdfGenerator\IR\Document\Content\Common\Color;
+
+$document = new LinearDocument([210, 297]);
+
+$normalFont = Font::createFromDefault();
+$normalText = new TextStyle($normalFont);
+
+// target address
+$margin = 15;
+$printer = $document->createPrinter(0, $margin, $margin);
+$printer->printText("Hello world", $normalText);
+
+// TODO: sign document
+$result = $document->save();
+file_put_contents('signature.pdf', $result);