Update run.py

run.py

@@ -9,6 +9,10 @@
 For example:
 
 python run.py predict data/PreFer_fake_data.csv PreFer_fake_data_predictions.csv 
+
+Optionally, you can use the score function to calculate evaluation scores given 
+your predictions and the ground truth within the training dataset.
+
 """
 
 import sys