Update README.md

Author: stephaneduprat

data-platform/core-converged-db/aq-teq/demo/README.md

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+## Demo
 
+This demo was designed and delivered to a real customer. It highlights how to setup and use AQ with the PL/SQL API.
+
+In script "001.setup.sql", we setup schemas and queue tables in a 19c Oracle Database, according to what is described in "Demo_slide.pdf".
+In script "002.SBS.test_AQ.sql" we will test basic AQ functionalities (enqueue and dequeue based on the rules described in "Demo_slide.pdf").
+In script "003.SBS.test_queue_propagation.sql" we will test queue propagation.