Create README.md

Author: alexkeh

session-demos/2019/oow/get-started/README.md

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+This ODP.NET Core sample shows how to connect to an Oracle Database, use anonymous PL/SQL, and statement batching.
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+Run this application from console project using .NET Core 2.1 or higher. The application logs into the HR schema. Prior to running this app:
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+1) Enter the HR password.
+2) Enter the database net service name, Easy Connect (Plus), or equivalent connection information.