Update README.md

HaoUNSW · web-flow · commit b611324c2cce · 2022-06-14T08:14:59.000+08:00
diff --git a/Dataset/README.md b/Dataset/README.md
@@ -11,3 +11,5 @@
 :smiley:Please note that only validation sets of three sub-sets (CT, ECL, SG) are provided as PISA examples during the submission period.
 
 :relaxed:After the acceptance decision notification, the full PISA dataset (including train/val/testing sets) will be uploaded here and publicly available.
+
+:hand: We strongly recommend users to register [SafeGraph Data for Academics](https://www.safegraph.com/academics) to know more about SafeGraph Data.
