Add accessibility examples for creating accessible PDF documents

Source/QuestPDF.DocumentationExamples/AccessibilityExamples.cs

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+using QuestPDF.Fluent;
+using QuestPDF.Helpers;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.DocumentationExamples;
+
+public class AccessibilityExamples
+{
+    [Test]
+    public void MinimalExample()
+    {
+        Document
+            .Create(document =>
+            {
+                document.Page(page =>
+                {
+                    page.Size(PageSizes.A5);
+                    page.Margin(30);
+
+                    page.Header()
+                        .PaddingBottom(15)
+                        .SemanticHeader1()
+                        .Text("Accessibility Test Document")
+                        .FontColor(Colors.Blue.Darken3)
+                        .FontSize(24)
+                        .Bold();
+                    
+                    page.Content()
+                        .Column(column =>
+                        {
+                            column.Spacing(20);
+                            
+                            column.Item()
+                                .SemanticSection()
+                                .Column(column =>
+                                {
+                                    column.Item()
+                                        .PaddingBottom(10)
+                                        .SemanticHeader2()
+                                        .Text("Section with text content")
+                                        .FontColor(Colors.Blue.Darken1)
+                                        .FontSize(16);
+                                    
+                                    column.Item()
+                                        .Text(Placeholders.Paragraphs())
+                                        .FontSize(12)
+                                        .ParagraphSpacing(8);
+                                });
+                            
+                            column.Item()
+                                .PreventPageBreak()
+                                .SemanticSection()
+                                .Column(column =>
+                                {
+                                    column.Item()
+                                        .PaddingBottom(10)
+                                        .SemanticHeader2()
+                                        .Text("Section with image")
+                                        .FontColor(Colors.Blue.Darken1)
+                                        .FontSize(16);
+                                    
+                                    column.Item()
+                                        .Width(250)
+                                        .SemanticImage("Image showing a laptop")
+                                        .Image("Resources/product.jpg");
+                                });
+                        });
+                });
+            })
+            .WithMetadata(new DocumentMetadata
+            {
+                Language = "en-US",
+                Title = "Accessibility Test",
+                Subject = "This document shows how easy it is to create accessible PDF documents with QuestPDF"
+            })
+            .WithSettings(new DocumentSettings
+            {
+                PDFA_Conformance = PDFA_Conformance.PDFA_3A,
+                PDFUA_Conformance = PDFUA_Conformance.PDFUA_1
+            })
+            .GeneratePdf("accessibility-minimal-example.pdf");
+    }
+}