Initial commits

examples/Cli/Help/CustomHelpProvider.cs

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+using System.Linq;
+using Spectre.Console;
+using Spectre.Console.Cli;
+using Spectre.Console.Cli.Help;
+using Spectre.Console.Rendering;
+
+namespace Help;
+
+/// <summary>
+/// Example showing how to extend the built-in Spectre.Console help provider
+/// by rendering a custom banner at the top of the help information
+/// </summary>
+internal class CustomHelpProvider : HelpProvider
+{
+    public CustomHelpProvider(ICommandAppSettings settings)
+        : base(settings)
+    {
+    }
+
+    public override IEnumerable<IRenderable> GetHeader(ICommandModel model, ICommandInfo? command)
+    {
+        return new[]
+        {
+            new Text("--------------------------------------"), Text.NewLine,
+            new Text("---      CUSTOM HELP PROVIDER      ---"), Text.NewLine,
+            new Text("--------------------------------------"), Text.NewLine,
+            Text.NewLine,
+        };
+    }
+}