Update README.md

Author: witold-swierzy

data-platform/core-converged-db/3rd-party-databases/README.md

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+# Core Converged DB
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+This area focuses on 3rd party databases.
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+
+# License
+
+Copyright (c) 2023 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/folder-structure/LICENSE) for more details.
+