Update README.md

Author: witold-swierzy

data-platform/autonomous-database/autonomous-json/migration_from_19c_lob_to_23ai_json_datatype/README.md

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+# Migration to JSON datatype
+
+This area provides an example of migration of JSON data from pre-23ai model, which used LOB to store JSON data to JSON datatype, which has been implemented in Oracle Database 23ai.
+
+# License
+
+Copyright (c) 2025 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.