Merge pull request ProgrammingBlockchain#132 from HugoDoyon/master

C# is faster

Author: NicolasDorier

introduction/why_c.md

@@ -9,6 +9,7 @@ The .NET framework is popular in corporate environments. We also believe this is
 *   C# is closely related to Java and C++. As such, it can be easily read by a big base of developers.
 *   Nicolas Dorier, one of the authors of this book, created the most popular Bitcoin Framework for .NET, called [NBitcoin](https://github.com/MetacoSA/NBitcoin).
 *   Every person I met who learned about C# will tell you it is the best language out there, even if it is not the one they are using at the moment.
+*   Recent Benchmark place .net Core C# performance way ahead of Java in almost every area. See for yourself [C# vs Java Benchmark](https://benchmarksgame-team.pages.debian.net/benchmarksgame/faster/csharp.html)
 
 The authors of this book have over 15 years combined experience with C#. It is our go-to language for any project for fun or profit.