Update README.md

Add description for new March 2024 update.

README.md

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 # Forecasting-Inflation-Rates-of-Poland
 Recently inflation is a popular topic in Poland and is highest since the 90s. Experts presume inflation in Poland should continue to rise. The time series forecasting was completed by implementing the autoregressive methods.
 
+* New update for March 2024. Inflation values were forecasted with deep learning: CNN & LSTM. The out-of sample predictions confirm that Polish inflation will continue to fall. Based on evaluation metrics and model residuals, the CNN is a better choice.
+
+|          | RMSE   | R<sup>2 | MAE    | MAPE [%] |
+|----------|--------|---------|--------|----------|
+| **CNN**  | 0.4008 | 0.9892  | 0.3012 | 0.1753   |
+| **LSTM** | 0.4957 | 0.9835  | 0.3736 | 0.2218   |
+
 * New update for March 2023.
 
 ![march_2023](https://user-images.githubusercontent.com/45270023/225881806-0ef77db7-9e9a-426d-88c2-0291da383201.jpg)