add root route

app.py

@@ -344,6 +344,9 @@ async def generate_3d(image: UploadFile = File(...)):
 @app.get("/test")
 async def test_():
     return JSONResponse(content={"TEST": "DONE!"})
+@app.get("/")
+async def root_():
+    return JSONResponse(content={"message": "HI!"})
 
 # with gr.Blocks(delete_cache=(600, 600)) as demo:
 #     gr.Markdown("""