Update README.md

README.md

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 **Conclusion:** LSTM significantly outperforms ARIMA with lower RMSE and MAPE, showing its ability to capture nonlinear patterns in stock prices.
 
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+### Rolling Window Evaluation
+| Model | RMSE (avg) | MAPE (avg) |
+|-------|------------|------------|
+| ARIMA (Rolling Window) | 3.448 | 0.0304 |
+| LSTM (Rolling Window)  | 23.282 | 0.1869 |
+
+Under rolling window evaluation, **ARIMA outperforms LSTM**, showing better stability and adaptability across multiple forecasting horizons.
+
 
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 ## ARIMA vs LSTM Forecasts