Create panel documentation

docs/input/assets/casts/panel-plain.cast

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+{"version": 2, "width": 122, "height": 24, "title": "panel (plain)", "env": {"TERM": "Spectre.Console"}}
+[0, "o", "\u2554\u2550\u2550\u001B[4mPasta Menu\u001B[0m\u2550\u2550\u2557\r\n\u2551              \u2551\r\n\u2551              \u2551\r\n\u2551  \u001B[31mSpaghetti\u001B[0m   \u2551\r\n\u2551  \u001B[31mLinguini\u001B[0m    \u2551\r\n\u2551  \u001B[31mFettucine\u001B[0m   \u2551\r\n\u2551  \u001B[31mTortellini\u001B[0m  \u2551\r\n\u2551  \u001B[31mCapellini\u001B[0m   \u2551\r\n\u2551  \u001B[31mLasagna\u001B[0m     \u2551\r\n\u2551              \u2551\r\n\u2551              \u2551\r\n\u255A\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u255D\r\n"]
+

docs/input/assets/casts/panel-rich.cast

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+{"version": 2, "width": 122, "height": 24, "title": "panel (rich)", "env": {"TERM": "Spectre.Console"}}
+[0, "o", "\u2554\u2550\u2550\u001B[4mPasta Menu\u001B[0m\u2550\u2550\u2557\r\n\u2551              \u2551\r\n\u2551              \u2551\r\n\u2551  \u001B[38;5;9mSpaghetti\u001B[0m   \u2551\r\n\u2551  \u001B[38;5;9mLinguini\u001B[0m    \u2551\r\n\u2551  \u001B[38;5;9mFettucine\u001B[0m   \u2551\r\n\u2551  \u001B[38;5;9mTortellini\u001B[0m  \u2551\r\n\u2551  \u001B[38;5;9mCapellini\u001B[0m   \u2551\r\n\u2551  \u001B[38;5;9mLasagna\u001B[0m     \u2551\r\n\u2551              \u2551\r\n\u2551              \u2551\r\n\u255A\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u255D\r\n"]
+

docs/input/widgets/panel.md

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+Title: Panel
+Order: 0
+RedirectFrom: panels
+Description: "The **Panel** widget can be used to organize text into a rendered box."
+Reference: T:Spectre.Console.Panel
+
+---
+
+The `Panel` widget can be used to organize text into a rendered box.
+
+<?# AsciiCast cast="panel" /?>
+
+## Usage
+
+To render a table, create a `Table` instance, passing a string to its constructor to assign the contents.
+
+```csharp
+var panel = new Panel("Hello World");
+```
+
+## Appearance
+
+# Headers
+
+```csharp
+// Sets the header
+panel.Header = new PanelHeader("Some text");
+```
+
+# Borders
+
+For a list of borders, see the [Borders](xref:borders) appendix section.
+
+```csharp
+// Sets the border
+panel.Border = BoxBorder.Ascii;
+panel.Border = BoxBorder.Square;
+panel.Border = BoxBorder.Rounded;
+panel.Border = BoxBorder.Heavy;
+panel.Border = BoxBorder.Double;
+panel.Border = BoxBorder.None;
+```
+
+# Padding
+
+```csharp
+// Sets the padding
+panel.Padding = new Padding(2, 2, 2, 2);
+```
+
+# Expand
+
+Enabling the Expand property will cause the Panel to be as wide as the console. 
+Otherwise, the Panel width will be automatically calculated based on its content.
+Note that this auto-calculation is not based on the Panel Header, so a Header that
+is long in length may get truncated with certain content.
+
+```csharp
+// Sets the expand property
+panel.Expand = true;
+```

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

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+using Spectre.Console;
+
+namespace Generator.Commands.Samples
+{
+    internal class PanelSample : BaseSample
+    {
+        public override void Run(IAnsiConsole console)
+        {
+            var panel = new Panel("[red]Spaghetti\nLinguini\nFettucine\nTortellini\nCapellini\nLasagna[/]");
+            panel.Header = new PanelHeader("[underline]Pasta Menu[/]", Justify.Center);
+            panel.Border = BoxBorder.Double;
+            panel.Padding = new Padding(2, 2, 2, 2);
+            console.Write(panel);
+        }
+    }
+}