Add Spectre.Cli to Spectre.Console

* Renames Spectre.Cli to Spectre.Console.Cli.
* Now uses Verify with Spectre.Console.Cli tests.
* Removes some duplicate definitions.

Closes #168

examples/Cli/Delegates/BarSettings.cs

@@ -0,0 +1,16 @@
+using System.ComponentModel;
+using Spectre.Console.Cli;
+
+namespace Delegates
+{
+    public static partial class Program
+    {
+        public sealed class BarSettings : CommandSettings
+        {
+            [CommandOption("--count")]
+            [Description("The number of bars to print")]
+            [DefaultValue(1)]
+            public int Count { get; set; }
+        }
+    }
+}

examples/Cli/Delegates/Delegates.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <IsPackable>false</IsPackable>
+    <ExampleName>Delegates</ExampleName>
+    <ExampleDescription>Demonstrates how to specify commands as delegates.</ExampleDescription>
+    <ExampleGroup>Cli</ExampleGroup>
+    <ExampleVisible>false</ExampleVisible>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\src\Spectre.Console\Spectre.Console.csproj" />
+  </ItemGroup>
+
+</Project>

examples/Cli/Delegates/Program.cs

@@ -0,0 +1,39 @@
+using System;
+using Spectre.Console.Cli;
+
+namespace Delegates
+{
+    public static partial class Program
+    {
+        public static int Main(string[] args)
+        {
+            var app = new CommandApp();
+            app.Configure(config =>
+            {
+                config.AddDelegate("foo", Foo)
+                    .WithDescription("Foos the bars");
+
+                config.AddDelegate<BarSettings>("bar", Bar)
+                    .WithDescription("Bars the foos"); ;
+            });
+
+            return app.Run(args);
+        }
+
+        private static int Foo(CommandContext context)
+        {
+            Console.WriteLine("Foo");
+            return 0;
+        }
+
+        private static int Bar(CommandContext context, BarSettings settings)
+        {
+            for (var index = 0; index < settings.Count; index++)
+            {
+                Console.WriteLine("Bar");
+            }
+
+            return 0;
+        }
+    }
+}