init: Initial project setup

app/bot.py

@@ -0,0 +1,35 @@
+__all__ = ("main",)
+
+from typing import Optional
+
+from aiogram import Bot, Dispatcher, types
+from aiogram.enums import ParseMode
+from aiogram.filters import CommandStart
+from aiogram.types import Message
+from aiogram.utils.markdown import hbold
+from app.config import Config
+
+
+dp = Dispatcher()
+
+
+@dp.message(CommandStart())
+async def command_start_handler(message: Message) -> None:
+    await message.answer(f"Hello, {hbold(message.from_user.full_name)}!")
+
+
+@dp.message()
+async def echo_handler(message: types.Message) -> None:
+    try:
+        await message.send_copy(chat_id=message.chat.id)
+    except TypeError:
+        await message.answer("Nice try!")
+
+
+async def main() -> None:
+    bot_token: Optional[str] = Config.BOT_TOKEN
+    if bot_token is not None:
+        bot = Bot(bot_token, parse_mode=ParseMode.HTML)
+        await dp.start_polling(bot)
+    else:
+        exit("BOT_TOKEN is not set")