Added documentation for Rows widget

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

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+{"version": 2, "width": 50, "height": 5, "timestamp": 1667278514, "env": {"SHELL": "/bin/bash", "TERM": "xterm-256color"}}
+[0, "o", "\u001b[38;5;9;48;5;0mItem 1\u001b[0m\r\n\u001b[38;5;2;48;5;0mItem 2\u001b[0m\r\n\u001b[38;5;12;48;5;0mItem 3\u001b[0m\r\n"]

docs/input/widgets/rows.md

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+Title: Rows
+Order: 20
+Description: "Use **Rows** to render widgets in horiztonal rows to the console."
+Highlights:
+    - Custom colors
+    - Labels
+    - Use your own data with a converter.
+Reference: T:Spectre.Console.Rows
+
+---
+
+Use `Rows` to render widgets in horizontal rows to the console.
+
+<?# AsciiCast cast="rows" /?>
+
+## Usage
+
+### Basic usage
+
+```csharp
+// Render two items on separate rows to Console
+AnsiConsole.Write(new Rows(
+            new Text("Item 1"),
+            new Text("Item 2")
+        ));
+```
+
+### Add items from an IEnumerable
+
+```csharp
+// Create a list of Items
+var rows = new List<Text>(){
+        new Text("Item 1"),
+        new Text("Item 2"),
+        new Text("Item 3")
+    };
+
+// Render each item in list on separate line
+AnsiConsole.Write(new Rows(rows));
+```
+
+### Apply custom styles to each row
+
+```csharp
+// Create a list of Items, apply separate styles to each
+var rows = new List<Text>(){
+    new Text("Item 1", new Style(Color.Red, Color.Black)),
+    new Text("Item 2", new Style(Color.Green, Color.Black)),
+    new Text("Item 3", new Style(Color.Blue, Color.Black))
+};
+
+// Renders each item with own style
+AnsiConsole.Write(new Rows(rows));
+```