feat: connect backend with the frontend

backend/main.py

@@ -1,4 +1,5 @@
 from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
 
 from backend.config import settings
 from backend.db import database, Base, engine
@@ -6,6 +7,14 @@ from backend.routes import shortener_router
 
 app = FastAPI()
 
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.get_allow_origins(),
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
 @app.on_event("startup")
 async def startup():
     await database.connect()