add init new files

app/main.py

@@ -0,0 +1,21 @@
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from starlette.middleware.sessions import SessionMiddleware
+
+from app.admin import mount_admin
+from app.api.v1.routes import router as v1_router
+from app.core.config import settings
+from app.db.init_db import init_db
+
+
+@asynccontextmanager
+async def lifespan(_: FastAPI):
+    init_db()
+    yield
+
+
+app = FastAPI(title=settings.APP_NAME, root_path=settings.ROOT_PATH, lifespan=lifespan)
+app.add_middleware(SessionMiddleware, secret_key=settings.ADMIN_SECRET_KEY)
+app.include_router(v1_router)
+mount_admin(app)