Create panel documentation

docs/input/widgets/panel.md

@@ -0,0 +1,61 @@
+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;
+```