add more examples to the examples solution

examples/MergePdfDocuments.cs

@@ -0,0 +1,30 @@
+namespace UglyToad.Examples
+{
+    using System;
+    using System.IO;
+    using System.Linq;
+    using PdfPig.Writer;
+
+    internal static class MergePdfDocuments
+    {
+        public static void Run(string filePath1, string filePath2, string filePath3)
+        {
+            var fileBytes = new[] { filePath1, filePath2, filePath3 }
+                .Select(File.ReadAllBytes).ToList();
+
+            var resultFileBytes = PdfMerger.Merge(fileBytes);
+
+            try
+            {
+                var location = AppDomain.CurrentDomain.BaseDirectory;
+                var output = Path.Combine(location, "outputOfMerge.pdf");
+                File.WriteAllBytes(output, resultFileBytes);
+                Console.WriteLine($"File output to: {output}");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Failed to write output to file due to error: {ex}.");
+            }
+        }
+    }
+}