include note about java version

Author: ken-zlai

docker-init/README.md

@@ -2,8 +2,9 @@
 
 This directory holds code to setup docker containers for dynamoDB, a spark master, and a spark worker. It also creates a container which contains a parquet table with example data containing anomolies. To start, run:
 
-> [!NOTE]
-> Make sure you have `docker>=20.10` installed.
+> **Note**  
+> Make sure you have `docker >= 20.10` installed.  
+> Make sure you have `jdk version 11 or 17` installed.
 
 
 ```bash