feat: add help command functionality

lua/CC Tweaked/tutel/tutel-host.lua

@@ -366,16 +366,28 @@ end
 registerConsoleCommand("turtles", turtlesCommand, "Lists all the linked turtles")
 
 function helpCommand(args)
+    if #args == 0 then
         log.info("----- commands -----")
         for _, cmd in pairs(consoleCommands) do
-        log.info("* %s", cmd.name)
-        log.info("* > %s", cmd.desc)
-        if cmd.usage then
-            log.info("* > Usage: %s", cmd.usage)
+            log.info("%s - %s", cmd.name, cmd.desc)
         end
+    else
+        local cmdName = args[1]
+        local cmd = consoleCommands[cmdName]
+
+        if not cmdName then
+            log.error("Unable to find command: %s", cmdName)
+            return
+        end
+
+        log.info("---- %s ----", cmdName)
+        log.info(cmd.desc)
+        log.info("Usage %s:", cmd.usage)
     end
 end
-registerConsoleCommand("help", helpCommand, "Prints out all the console commands")
+
+registerConsoleCommand("help", helpCommand, "Prints out all the console commands or usage of a specified command",
+    "help or help (command name)")
 
 --[[
     drawing functions