Added the start function and initiated the bot in echo mode

src/bot/handlers.py

@@ -0,0 +1,35 @@
+from telegram import Update
+from telegram.ext import (
+    filters,
+    ContextTypes,
+    CommandHandler,
+    MessageHandler
+)
+
+def log_errors(f):
+    def inner(*args, **kwargs):
+        try:
+            return f(*args, **kwargs)
+        except Exception as e:
+            error_message = f'Произошла ошибка: {e}'
+            print(error_message)
+            raise e
+    return inner
+
+async def start(update: Update, context: ContextTypes.DEFAULT_TYPE):
+    await context.bot.send_message(
+        chat_id=update.effective_chat.id,
+        text=(
+            'Привет, я бот онлайн школы GoodStart.\n\n'
+            'Здесь ты найдёшь лучших преподавателей.')
+    )
+
+@log_errors
+async def echo(update: Update, context: ContextTypes.DEFAULT_TYPE):
+    await context.bot.send_message(
+        chat_id=update.effective_chat.id,
+        text=update.message.text
+    )
+
+start_handler = CommandHandler('start', start)
+echo_handler = MessageHandler(filters.TEXT & (~filters.COMMAND), echo)

src/bot/management/commands/runbot.py

@@ -0,0 +1,24 @@
+import logging
+import sys
+
+from django.core.management.base import BaseCommand
+from django.conf import settings
+from telegram.error import Forbidden
+from telegram.ext import ApplicationBuilder
+
+from bot.handlers import start_handler, echo_handler
+
+class Command(BaseCommand):
+    help = 'Телеграм-бот'
+
+    def handle(self, *args, **kwargs):
+        try:
+            pass
+        except Forbidden:
+            logging.error("Invalid TELEGRAM_TOKEN.")
+            sys.exit(1)
+
+        bot = ApplicationBuilder().token(settings.TELEGRAM_TOKEN).build()
+        bot.add_handler(start_handler)
+        bot.add_handler(echo_handler)
+        bot.run_polling()

src/core/settings.py

@@ -81,3 +81,5 @@
 STATIC_URL = "static/"
 
 DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
+
+TELEGRAM_TOKEN = 'нужно импортировать из environ'