Telegram bot submenu implementation

This project implements a submenu using the python-telegram-bot library:

1. Import the necessary classes and methods;

2. Function for processing the /start command;

3. Function for processing button clicks in the menu;

Also in the file config.py prescribing a token

Example config.py: TOKEN = '6877345639:AAEg5fmepvlWjc_OfmfhbsVJp38hRfr8k8r'