Create README.md

Author: uschwinn

data-platform/core-converged-db/db-performance/performancehub/README.md

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+# Performance Hub
+This folder provides SQL scripts to generate active Performance Hub reports. The Oracle provided script perfhubrpt.sql and the PL/SQL package DBMS_PERF especially REPORT_PERFHUB will be used.
+Information on the script usage can also be found in the blog posting [Performance Hub - the database tuning gem](https://blogs.oracle.com/coretec/post/oracle-performance-hub)
+Refer also to the [DBMS_PERF documentation](https://docs.oracle.com/en/database/oracle/oracle-database/21/arpls/DBMS_PERF.html#GUID-85CD8AB9-B6E0-444F-91A5-762EB92A74E9) to get detailled information on the parameters which can be used.
+
+REM Please note the user needs to have DBA privileges.
+
+### Performance Hub scripts
+
+-  Use the Oracle provided script perfhubrpt.sql: perfhubscript.sql
+-  Example for DBMS_PERF.REPORT_PERFHUB with default settings: dbmsperf_def.sql
+-  Example for DBMS_PERF.REPORT_PERFHUB with parameters: dbmsperf_1.sql
+
+
+  # License
+
+Copyright (c) 2023 Oracle and/or its affiliates.
+
+Licensed under the Universal Permissive License (UPL), Version 1.0.
+
+See LICENSE for more details.