Add layout documentation

resources/scripts/Generator/Commands/AsciiCast/Samples/LayoutSample.cs

@@ -0,0 +1,30 @@
+using Spectre.Console;
+using Spectre.Console.Json;
+
+namespace Generator.Commands.Samples
+{
+    public class LayoutSample : BaseSample
+    {
+        public override (int Cols, int Rows) ConsoleSize => (80, 24);
+
+        public override void Run(IAnsiConsole console)
+        {
+            var layout = new Layout("Root")
+                .SplitColumns(
+                    new Layout("Left"),
+                    new Layout("Right")
+                        .SplitRows(
+                            new Layout("Top"),
+                            new Layout("Bottom")));
+
+            layout["Left"].Update(
+                new Panel(
+                    Align.Center(
+                        new Markup("Hello [blue]World![/]"),
+                        VerticalAlignment.Middle))
+                    .Expand());
+
+            AnsiConsole.Write(layout);
+        }
+    }
+}