Create README.md

added new asset

Author: phantompete

data-platform/open-source-data-platforms/oci-data-flow/code-examples/db-connectors-and-streaming/README.md

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+# OCI Data Flow Connection to ADB/PostgreSQL/OCI Streaming
+
+Reviewed: 9.08.2024
+
+# When to use this asset?
+
+When you intend to connect/integrate Data Flow with the Autonomous Database/PostgreSQL or OCI Streaming.
+Supported scenarios:
+- 1. Oracle Databases
+    - 1. Autonomous Database with a Public Endpoint
+    - 2. Autonomous Database with a Private Endpoint
+    - 3. Autonomous Database (Wallet Connection)
+- 2. Non-Oracle Databases
+    - 1. PostgreSQL
+- 3. Other Scenarios
+    - 1. PostgreSQL to Autonomous
+    - 2. Configuring OCI Streaming
+    - 3. Consuming messages from Stream
+    - 4. Producing messages to Stream
+
+# How to use this asset?
+
+- You can start creating your cluster and testing the connections directly in this notebook.
+- There is a special place dedicated for storing your credentials (Testing purposes only!)
+- Happy with the testing? Modify the code in this notebook and create your own OCI Data Flow application.
+  
+# License
+
+Copyright (c) 2024 Oracle and/or its affiliates.
+
+Licensed under the Universal Permissive License (UPL), Version 1.0.
+
+See [LICENSE](https://github.com/oracle-devrel/technology-engineering/blob/main/LICENSE) for more details.