Initial version of the Base Database document

Author: Antoun Moubarak

cloud-architecture/custom-apps-and-consolidation/basedb-service/README.md

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+# Placeholder
+
+This document describes a sample architecture of an Oracle database migration from on-prenises to OCI Base Database Service.
+
+# 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.