Update README.md

Author: K55Toms

data-platform/open-source-data-platforms/README.md

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-# Placeholder
+# Open Source Data Platforms 
+Open Source Data Platforms continue to extend the Oracle Data Platform with Key Open Source Offerings including:
+- Big Data Service
+- MySQL Heatwave
+- Data Flow (Apache SPARK)
+- OCI Streaming (Kafka)
 
+# Useful Links
+
+- [OCI Big Data Service ](https://www.oracle.com/uk/big-data/big-data-service/)
+- [OCI Big Data Blog](https://blogs.oracle.com/bigdata)
+- [OCI Data Flow (Apache SPARK Service)](https://www.oracle.com/uk/big-data/data-flow/)
+- [OCI MySQL Heatwave](https://www.oracle.com/uk/mysql/)
+
+
+  
 # License
 
 Copyright (c) 2023 Oracle and/or its affiliates.