Add commands suggestions via set_my_commands api method

* add command suggestions via set_my_commands method

* update README to remove manual instructions for bot menu

bot/bot.py

@@ -9,8 +9,15 @@ from pathlib import Path
 from datetime import datetime
 
 import telegram
-from telegram import Update, User, InlineKeyboardButton, InlineKeyboardMarkup
+from telegram import (
+    Update, 
+    User, 
+    InlineKeyboardButton, 
+    InlineKeyboardMarkup, 
+    BotCommand
+)
 from telegram.ext import (
+    Application,
     ApplicationBuilder,
     CallbackContext,
     CommandHandler,
@@ -299,11 +306,21 @@ async def error_handle(update: Update, context: CallbackContext) -> None:
     except:
         await context.bot.send_message(update.effective_chat.id, "Some error in error handler")
 
+async def post_init(application: Application):
+    await application.bot.set_my_commands([
+        BotCommand("/new", "Start new dialog"),
+        BotCommand("/mode", "Select chat mode"),
+        BotCommand("/retry", "Re-generate response for previous query"),
+        BotCommand("/balance", "Show balance"),
+        BotCommand("/help", "Show help message"),
+    ])
+
 def run_bot() -> None:
     application = (
         ApplicationBuilder()
         .token(config.telegram_token)
         .concurrent_updates(True)
+        .post_init(post_init)
         .build()
     )