Add FastAPI backend and React frontend setup with initial routes and components

backend/app/routers/example_router.py

@@ -0,0 +1,11 @@
+from fastapi import APIRouter
+
+router = APIRouter(
+    prefix="/api",
+    tags=["example"],
+    responses={404: {"description": "Not found"}},
+)
+
+@router.get("/items")
+async def read_items():
+    return [{"name": "Item 1"}, {"name": "Item 2"}]