Added Clean Code .NET (#3446)

free-programming-books.md

@@ -1897,6 +1897,7 @@ Kerridge (PDF) (email address *requested*, not required)
 
 ### .NET Framework
 
+* [Clean Code .NET](https://github.com/thangchung/clean-code-dotnet)
 * [Entity Framework](http://weblogs.asp.net/zeeshanhirani/my-christmas-present-to-the-entity-framework-community)
 * [Game Creation with XNA](https://en.wikibooks.org/wiki/Game_Creation_with_XNA) - Wikibooks
 * [.NET for Visual FoxPro Developers](http://foxcentral.net/microsoft/NETforVFPDevelopers.htm)