Update README.md

Author: witold-swierzy

data-platform/core-converged-db/jdbc-23c-new-features/README.md

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+# OracleJDBC23cNewFeatures
+This repo contains working code of examples demonstrating Reactive API support provided in Oracle JDBC Driver 23c
+Before running the code there is need to provide in the code
+1. database connection string - it should point into a 21c or 23c database
+2. username
+3. password
+
+Also it is needed to create database structures (a table, a sequence and a trigger) used by this demo.
+It can be done by executing jdb23cnfdemotable.sql script from, for example, SQL Developer, SQLcl or SQL*Plus
+To build and run this project there's need to use Maven (POM file contains all the dependencies, including JDBC driver)
+