add /t command information

@@ -137,3 +137,9 @@ bot.onText(/^\/(t|translate)($| ((.|\n)+))/, (msg, match) => {
     translate(received_msg, chatId);
   }
 });
+bot.onText(/^\/(h|help)/, (msg, match) => {
+    const chatId = msg.chat.id;
+    const helpText = "/t\nIt can Translate Korean into English or the language of other countries into Korean.\
+\nusage: /t [msg] or reply /t"
+    bot.sendMessage(chatId, helpText);
+});
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