Add XML docs

UI/CLI/ICommand.cs

@@ -2,11 +2,25 @@ namespace RemSox.UI.GUI.CLI;
 
 using System;
 
+/// <summary>
+/// Defines a command executable via the CLI or GUI terminal.
+/// </summary>
 public interface ICommand
 {
+    /// <summary>
+    /// Gets the name of the command used to invoke it.
+    /// </summary>
     string Name { get; }
 
+    /// <summary>
+    /// Gets a brief description of the command's functionality.
+    /// </summary>
     string Description { get; }
 
+    /// <summary>
+    /// Executes the command.
+    /// </summary>
+    /// <param name="arguments">The arguments provided to the command.</param>
+    /// <param name="printLine">A delegate to stream output lines to the current console or terminal.</param>
     void Execute(string? arguments, Action<string> printLine);
 }