Move Spectre.Console.Cli to it's own package

src/Spectre.Console.Cli/AsyncCommand.cs

@@ -0,0 +1,32 @@
+namespace Spectre.Console.Cli;
+
+/// <summary>
+/// Base class for an asynchronous command with no settings.
+/// </summary>
+public abstract class AsyncCommand : ICommand<EmptyCommandSettings>
+{
+    /// <summary>
+    /// Executes the command.
+    /// </summary>
+    /// <param name="context">The command context.</param>
+    /// <returns>An integer indicating whether or not the command executed successfully.</returns>
+    public abstract Task<int> ExecuteAsync(CommandContext context);
+
+    /// <inheritdoc/>
+    Task<int> ICommand<EmptyCommandSettings>.Execute(CommandContext context, EmptyCommandSettings settings)
+    {
+        return ExecuteAsync(context);
+    }
+
+    /// <inheritdoc/>
+    Task<int> ICommand.Execute(CommandContext context, CommandSettings settings)
+    {
+        return ExecuteAsync(context);
+    }
+
+    /// <inheritdoc/>
+    ValidationResult ICommand.Validate(CommandContext context, CommandSettings settings)
+    {
+        return ValidationResult.Success();
+    }
+}