Added ReadMe

Author: johnsonmanickam

README.md

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+# Import Data from SQL Server to Excel in C#
+
+This repository contains Syncfusion Excel library examples that illustrates,
+
+* How to import data from SQL Server to Excel in C#
+* How to import using query parameters in Excel table
+* How to refresh Excel data from a database
+
+This works without Microsoft Excel Interop.