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/bot.py

@@ -0,0 +1,32 @@
+import asyncio
+import logging
+from os import getenv
+
+from handlers.echo import echo_router
+from handlers.start import start_router
+
+from aiogram import Bot, Dispatcher
+from aiogram.enums import ParseMode
+
+# Bot token can be obtained via https://t.me/BotFather
+TOKEN = getenv("BOT_TOKEN")
+
+
+async def main() -> None:
+    # Dispatcher is a root router
+    dp = Dispatcher()
+    # Register all the routers from handlers package
+    dp.include_routers(
+        start_router,
+        echo_router,
+    )
+
+    # Initialize Bot instance with a default parse mode which will be passed to all API calls
+    bot = Bot(TOKEN, parse_mode=ParseMode.HTML)
+    # And the run events dispatching
+    await dp.start_polling(bot)
+
+
+if __name__ == "__main__":
+    logging.basicConfig(level=logging.INFO)
+    asyncio.run(main())