Create README.md

Author: witold-swierzy

data-platform/autonomous-ai-database/autonomous-ai-json/ai-json-cloud-demo/README.md

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+This repository contains demo presenting capabilities of Oracle Database related to processing external JSON data stored in Object Storage buckets.
+It consists of the following files:
+* utl_json_cloud.* - this is the definition of PL/SQL package UTL_JSON_CLOUD, which is used in the demo
+    this package provides
+      wrappers for credential creation procedures allowing to create a credential object in the same way regardless of the flavour of the database
+      procedures automatizing creation of JSON collection views pointing to external JSON data
+* demo.sql - demo presenting reading, importing, exporting and managing the external JSON data
+
+# 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.