Created a Columns widget documentation

docs/input/widgets/columns.md

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+Title: Columns
+Description: "Use **Columns** to render widgets in vertical columns to the console."
+Highlights:
+    - Custom colors
+    - Labels
+    - Use your own data with a converter.
+Reference: T:Spectre.Console.Columns
+
+---
+
+Use `Columns` to render widgets in vertical columns to the console.
+
+<?# AsciiCast cast="columns" /?>
+
+## Usage
+
+### Basic usage
+
+```csharp
+// Render two items on separate columns to Console
+AnsiConsole.Write(new Columns(
+            new Text("Item 1"),
+            new Text("Item 2")
+        ));
+```
+
+### Add items from an IEnumerable
+
+```csharp
+// Create a list of Items
+var columns = 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 Columns(columns));
+```
+
+### Apply custom styles to each column
+
+```csharp
+// Create a list of Items, apply separate styles to each
+var columns = 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 Columns(columns));
+```
+