[feat] add settings with some example schema, initialization and run functionality

src/bot/callbacks/__init__.py

@@ -1,3 +1,14 @@
-from aiogram import Router
+from aiogram import F, Router
+from aiogram.types import CallbackQuery
+
+from . import settings
 
 router = Router()
+router.include_routers(
+    settings.router,
+)
+
+
+@router.callback_query(F.data == "_")
+async def on_empty(callback: CallbackQuery):
+    await callback.answer()