added metric section

app.py

@@ -138,6 +138,13 @@ def load_interface():
         of the prediction based on the longitude and latitude inputs. The predicted UHI index and the status (Urban Heat Island or Cooler Region) will be displayed.\n
         >NOTE: The longitude and latitude inputs are used to identify the location of the prediction, but they do not affect the UHI index prediction.\n
 
+        ## Metrics
+        For a quick look of our model performance, here is its r2 score:
+        ```
+        Train r2 score:  0.9853446142702935
+        Test r2 score:   0.9625555699901284
+        ```
+
         ## Repository
         The code for this project is available on GitHub. It includes our Jupyter notebooks and Final Report.\n
         [Project Repo](https://github.com/FranciscoLozCoding/cooling_with_code)