Create README.md

Created README for XML-DB presentations.

Author: uschwinn

data-platform/core-converged-db/xml-db/xml-db-presentations/README.md

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+## XML DB Presentations
+
+Reviewed: 2.05.2024
+
+# When to use this asset?
+
+To present or to learn about Oracle XML DB basics and about release 23 feature Transportable Binary XML.
+
+# How to use this asset?
+
+Use PDF as a presentation.
+
+# 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.