add backend base to the project

backend/utils/email.py

@@ -0,0 +1 @@
+from django.core.mail import send_mail

backend/utils/pagination.py

@@ -0,0 +1,5 @@
+from rest_framework.pagination import LimitOffsetPagination
+
+class StructurePagination(LimitOffsetPagination):
+    default_limit = 10
+    max_limit = 100

backend/utils/telegram_bot.py

@@ -0,0 +1,8 @@
+import telebot
+from django.conf import settings
+
+
+bot = telebot.TeleBot(settings.TELEGRAM_BOT_TOKEN)
+
+def send_telegram_message(chat_id, message):
+    bot.send_message(chat_id, message)