Create README.md

Author: stephaneduprat

data-platform/core-converged-db/multitenant/step-by-steps/README.md

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+# Multitenant
+
+The Multitenant option allows the containerization of Oracle database. By creating pluggable databases in a Container database, we can achieve more management flexibility, under the concept of "Manage many as one".  
+ 
+## Useful scripts and step by steps
+
+In this section you'll find step by step scripts:
+
+- Unplug/plug a PDB, with or without its data
+- Setup an application container with application PDB
+- Create and manage a proxy application container
+
+ # 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.