add get route

app.py

@@ -29,6 +29,10 @@ def predict_image(img):
     img = np.array(img)
     return f"{learn.predict(img)[0][0]:.2f}"
 
+@app.get("/")
+def read_root():
+    return {"message": "Hello World"}
+
 @app.post("/predict")
 async def predict(data: ImageData):
     try: