Add startup handler

anymusicbot/handlers/initialize/__init__.py

@@ -0,0 +1 @@
+from .initializer import router

anymusicbot/handlers/initialize/initializer.py

@@ -0,0 +1,10 @@
+from aiogram import Router, Bot
+from rich import print
+
+
+router = Router()
+
+
+@router.startup()
+async def startup(bot: Bot):
+    print(f'[green]Started as[/] @{(await bot.me()).username}')