Added documentation guide for Grid Widget (#1043)

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

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+{"version": 2, "width": 40, "height": 3, "timestamp": 1667342769, "env": {"SHELL": "/bin/bash", "TERM": "xterm-256color"}}
+[0.0, "o", "\u001b[38;5;9;48;5;0mHeader 1\u001b[0m  \u001b[38;5;2;48;5;0mHeader 2\u001b[0m  \u001b[38;5;12;48;5;0mHeader 3\u001b[0m\r\nRow 1      Row 2       Row 3\r\n"]

docs/input/widgets/grid.md

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+Title: Grid
+Order: 45
+Description: "Use **Grid** to render items in a grid pattern."
+Highlights:
+    - Custom colors
+    - Labels
+    - Use your own data with a converter.
+Reference: T:Spectre.Console.Grid
+
+---
+
+Use `Grid` to render items in a grid pattern.
+
+<?# AsciiCast cast="grid" /?>
+
+## Usage
+
+### Basic usage
+
+```csharp
+var grid = new Grid();
+        
+// Add columns 
+grid.AddColumn();
+grid.AddColumn();
+grid.AddColumn();
+
+// Add header row 
+grid.AddRow(new string[]{"Header 1", "Header 2", "Header 3"});
+grid.AddRow(new string[]{"Row 1", "Row 2", "Row 3"});
+
+// Write to Console
+AnsiConsole.Write(grid);
+```
+
+### Align and style items within cells
+
+```csharp
+var grid = new Grid();
+        
+// Add columns 
+grid.AddColumn();
+grid.AddColumn();
+grid.AddColumn();
+
+// Add header row 
+grid.AddRow(new Text[]{
+    new Text("Header 1", new Style(Color.Red, Color.Black)).LeftAligned(),
+    new Text("Header 2", new Style(Color.Green, Color.Black)).Centered(),
+    new Text("Header 3", new Style(Color.Blue, Color.Black)).RightAligned()
+});
+
+// Add content row 
+grid.AddRow(new Text[]{
+    new Text("Row 1").LeftAligned(),
+    new Text("Row 2").Centered(),
+    new Text("Row 3").RightAligned()
+});
+
+// Write centered cell grid contents to Console
+AnsiConsole.Write(grid);
+```
+
+### Embed a grid within a grid
+
+```csharp
+var grid = new Grid();
+        
+// Add columns 
+grid.AddColumn();
+grid.AddColumn();
+grid.AddColumn();
+
+// Add header row 
+grid.AddRow(new Text[]{
+    new Text("Header 1", new Style(Color.Red, Color.Black)).LeftAligned(),
+    new Text("Header 2", new Style(Color.Green, Color.Black)).Centered(),
+    new Text("Header 3", new Style(Color.Blue, Color.Black)).RightAligned()
+});
+
+var embedded = new Grid();
+
+embedded.AddColumn();
+embedded.AddColumn();
+
+embedded.AddRow(new Text("Embedded I"), new Text("Embedded II"));
+embedded.AddRow(new Text("Embedded III"), new Text("Embedded IV"));
+
+// Add content row 
+grid.AddRow(
+    new Text("Row 1").LeftAligned(),
+    new Text("Row 2").Centered(),
+    embedded
+);
+
+// Write centered cell grid contents to Console
+AnsiConsole.Write(grid);
+```