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/Calendars/Calendars.csproj

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

examples/Console/Calendars/Program.cs

@@ -0,0 +1,19 @@
+using Spectre.Console;
+
+namespace Calendars
+{
+    public static class Program
+    {
+        public static void Main(string[] args)
+        {
+            AnsiConsole.WriteLine();
+            AnsiConsole.Render(new Calendar(2020, 10)
+                    .RoundedBorder()
+                    .HighlightStyle(Style.Parse("red"))
+                    .HeaderStyle(Style.Parse("yellow"))
+                    .AddCalendarEvent("An event", 2020, 9, 22)
+                    .AddCalendarEvent("Another event", 2020, 10, 2)
+                    .AddCalendarEvent("A third event", 2020, 10, 13));
+        }
+    }
+}