Create README.md

Author: Sierra93

README.md

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+Getting Started
+
+NuGet package name is DocumentFormat.OpenXml. Let’s install this package.
+
+// Read and Create/Write Excel file in C# .NET Core
+https://www.thecodebuzz.com/read-excel-file-in-dotnet-core-2-1/ 
+
+// Read Excel as JSON using Open XML SDK
+https://www.thecodebuzz.com/read-excel-as-json-using-open-xml-sdk/