Add README for DevExpress VCL Reports example

This README provides an overview of the DevExpress VCL Reports example, detailing dataset record selection and report generation.

Author: dmitry-eliseev-devexpress

README.md

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+# DevExpress VCL Reports - Data Record Filtering in a Report
+
+This example allows you to select individual dataset records in a DevExpress VCL [Data Grid](https://docs.devexpress.com/VCL/cxGrid.TcxGrid?v=25.2) control and display selected records in a built report using the [Report Viewer](https://docs.devexpress.com/XtraReports/401850/web-reporting/web-document-viewer) dialog.
+Source data is stored in a memory-based dataset ([TdxMemData](https://docs.devexpress.com/VCL/dxmdaset.TdxMemData) inherited from the [TDataSet](https://docwiki.embarcadero.com/Libraries/Athens/en/Data.DB.TDataSet) class shipped with the standard VCL library).
+
+## Testing the example
+
+Run the sample app and check any records in a table:
+
+Click the **Preview Report** button to display a report containing all selected records in the [Report Viewer](https://docs.devexpress.com/XtraReports/401850/web-reporting/web-document-viewer) dialog.