Backend finished

Co-authored-by: Álvaro <alvaro6gv@users.noreply.github.com>

backend/app/main.py

@@ -0,0 +1,16 @@
+from typing import Union
+from fastapi import FastAPI
+from app.routes import users, auth
+
+"""
+    ENDPOINTS:
+    GET /users/
+    GET /users/{user_id}
+    POST /users
+    POST /2fa
+"""
+app = FastAPI(title="FastAPI + MariaDB + 2FA Example")
+
+# Registramos las rutas
+app.include_router(users.router, tags=["Users"])
+app.include_router(auth.router, tags=["Authentication"])