Add examples of how to use Spectre.Console

examples/Grid/Grid.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <IsPackable>false</IsPackable>
+    <Description>Demonstrates how to render grids in a console.</Description>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Spectre.Console\Spectre.Console.csproj" />
+  </ItemGroup>
+
+</Project>

examples/Grid/Program.cs

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+using System;
+using Spectre.Console;
+
+namespace GridExample
+{
+    public sealed class Program
+    {
+        static void Main(string[] args)
+        {
+            AnsiConsole.WriteLine();
+            AnsiConsole.MarkupLine("Usage: [grey]dotnet [blue]run[/] [[options] [[[[--] <additional arguments>...]][/]");
+            AnsiConsole.WriteLine();
+
+            var grid = new Grid();
+            grid.AddColumn(new GridColumn { NoWrap = true });
+            grid.AddColumn(new GridColumn { NoWrap = true, Width = 2 });
+            grid.AddColumn();
+            grid.AddRow("Options:", "", "");
+            grid.AddRow("  [blue]-h[/], [blue]--help[/]", "", "Show command line help.");
+            grid.AddRow("  [blue]-c[/], [blue]--configuration[/] <CONFIGURATION>", "", "The configuration to run for.");
+            grid.AddRow("  [blue]-v[/], [blue]--verbosity[/] <LEVEL>", "", "Set the [grey]MSBuild[/] verbosity level.");
+
+            AnsiConsole.Render(grid);
+        }
+    }
+}