Update README.md

Author: Fe-Bell

README.md

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 # ReflectXMLDB
 Simple database handler based on XML serialization and reflection.
 
-This is a simple project that aims for C#/.NET beginners to achieve database functionality in their applications. The project is written for .NET Standard 2.0, which is compatible with .NET Core 2.0+ and .NET Framework 4.6.1+.
+This is a simple project that aims for C#/.NET beginners to achieve database functionality in their applications. The project is written for [.NET Standard](https://docs.microsoft.com/en-us/dotnet/standard/net-standard) 2.0, which is compatible with .NET Core 2.0+ and .NET Framework 4.6.1+.
 
 ReflectXMLDB is cross platform and can run in Windows, Linux and MacOS operating systems that support the .Net Core initiative.