added help for commands.

RecrownedAthenaeum.ConsoleTools/CommandProcessor/ICommandEngineCommand.cs

@@ -6,6 +6,18 @@ namespace RecrownedAthenaeum.Tools.CommandProcessor
 {
     interface ICommandEngineCommand
     {
+        /// <summary>
+        /// Runs the command.
+        /// </summary>
+        /// <param name="arguments">Commands to be used. May be null.</param>
         void Run(string[] arguments);
+
+        /// <summary>
+        /// Returns the help for the given argument.
+        /// If no argument is given (null), then returns overall help statement.
+        /// </summary>
+        /// <param name="argument">The argument the help string is for. Can be null for overall command help.</param>
+        /// <returns>The text to help understand the argument.</returns>
+        string Help(string argument);
     }
 }