Added comment

make_dataset.py

@@ -1,3 +1,19 @@
+"""
+The TransCrowd paper lists ShanghaiTech dataset as from here: 
+
+    https://drive.google.com/file/d/1CkYppr_IqR1s6wi53l2gKoGqm7LkJ-Lc/view
+
+Alternatively, you could prob. download from here: 
+
+    https://www.kaggle.com/datasets/tthien/shanghaitech?resource=download
+
+After downloading, execute:
+
+    $ unzip <downloaded-zip-file> -d <repo-dir>/synchronous/dataset/
+
+To unzip the dataset correctly prior to running this script. 
+"""
+
 import os
 import glob
 import random