Update MathEngine.py

MathEngine.py

@@ -27,4 +27,8 @@ def calculate(request: CalculationRequest):
     else:
         raise HTTPException(status_code=400, detail="Invalid operation")
 
-    return {"result": result}
+    return {"result": result}
+
+@app.get("/")
+def read_root():
+    return {"message": "Hello, World!"}