Reorganize project structure

RemSox.Kernel/UI/CLI/Commands/HelpCommand.cs

@@ -0,0 +1,20 @@
+namespace RemSox.Kernel.UI.CLI.Commands;
+
+public sealed class HelpCommand : ICommand
+{
+    public string Name => "help";
+
+    public string Description => "Show this help message";
+
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
+    {
+        printLine("Available commands:");
+
+        foreach (ICommand command in CommandManager.GetCommands())
+        {
+            printLine($"  {command.Name,-12} - {command.Description}");
+        }
+
+        return Task.CompletedTask;
+    }
+}