Create README.md

Author: witold-swierzy

data-platform/core-converged-db/Java_API_for_Property_Graphs/README.md

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+property graph demo
+this code demonstrates:
+   1. integration of Property Graph with SQL in Oracle Database 23c
+   2. Java API for Property Graph Server
+   It uses demonstration tables described in the following LiveLabs Workshop:
+   "Analyze, Query, and Visualize Property Graphs with Oracle Database"
+   https://apexapps.oracle.com/pls/apex/r/dbpm/livelabs/run-workshop?p210_wid=686&p210_wec=&session=108772142407826
+Requirements:
+   1. Oracle Database 23c
+   2. Database user account ( <username> ) with the privileges described in the mentioned LiveLabs Workshop
+   3. Tables used in this workshop created in the mentioned schema
+   4. Oracle Property Graph Server installation using user account