Examples/dev 3x multi file (#1254)

* Add multi-file bot example

This commit adds a multi-file bot example to the repository. .

* Refactor: Clean up code formatting for consistency

* add Changelog

* Refactor bot code, fix changelog version

examples/multi_file_bot/handlers/echo.py

@@ -0,0 +1,21 @@
+from aiogram import Router
+from aiogram.filters import Command
+from aiogram.types import Message
+
+# For each module with handlers we can create a separate router.
+echo_router = Router()
+
+
+@echo_router.message()
+async def echo_handler(message: Message) -> None:
+    """
+    Handler will forward receive a message back to the sender
+
+    By default, message handler will handle all message types (like a text, photo, sticker etc.)
+    """
+    try:
+        # Send a copy of the received message
+        await message.send_copy(chat_id=message.chat.id)
+    except TypeError:
+        # But not all the types is supported to be copied so need to handle it
+        await message.answer("Nice try!")