Update README.md (#273)

Author: adhanara

sql-firewall/README.md

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 # Oracle SQL Firewall sample demo scripts
-This folder stores Oracle SQL Firewall sample demo scripts for Oracle Database 23c Free – Developer Release 
+This folder contains Oracle SQL Firewall sample demo script (demo.sql) which you can run in Oracle Database 23c Free – Developer Release. The demo script enables SQL Firewall and shows you different configurations with regards to capturing authorized SQL traffic, generating allow list and enforcement which includes blocking.
+Refer to the youtube channel video on SQL Firewall incase you want to see this demo in action: https://www.youtube.com/watch?v=cnw5AB9_Z9k&ab_channel=OracleDatabaseProductManagement 
+Other references to sample demo flows:
+    https://gavinsoorma.com.au/knowledge-base/oracle-database-23c-new-feature-sql-firewall/