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/Console/Panels/Panels.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <ExampleTitle>Panels</ExampleTitle>
+    <ExampleDescription>Demonstrates how to render items in panels.</ExampleDescription>
+    <ExampleGroup>Widgets</ExampleGroup>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\src\Spectre.Console\Spectre.Console.csproj" />
+  </ItemGroup>
+
+</Project>

examples/Console/Panels/Program.cs

@@ -0,0 +1,42 @@
+using Spectre.Console;
+
+namespace PanelExample
+{
+    public static class Program
+    {
+        public static void Main()
+        {
+            var content = new Markup(
+                "[underline]I[/] heard [underline on blue]you[/] like panels\n\n\n\n" +
+                "So I put a panel in a panel").Centered();
+
+            AnsiConsole.Render(
+                new Panel(
+                    new Panel(content)
+                        .Border(BoxBorder.Rounded)));
+
+            // Left adjusted panel with text
+            AnsiConsole.Render(
+                new Panel(new Text("Left adjusted\nLeft").LeftAligned())
+                    .Expand()
+                    .SquareBorder()
+                    .Header("[red]Left[/]"));
+
+            // Centered ASCII panel with text
+            AnsiConsole.Render(
+                new Panel(new Text("Centered\nCenter").Centered())
+                    .Expand()
+                    .AsciiBorder()
+                    .Header("[green]Center[/]")
+                    .HeaderAlignment(Justify.Center));
+
+            // Right adjusted, rounded panel with text
+            AnsiConsole.Render(
+                new Panel(new Text("Right adjusted\nRight").RightAligned())
+                    .Expand()
+                    .RoundedBorder()
+                    .Header("[blue]Right[/]")
+                    .HeaderAlignment(Justify.Right));
+        }
+    }
+}