Add link to XmlResult repo

Author: Eilon

README.md

@@ -14,5 +14,6 @@ Related community projects:
 * [ASP.NET MVC Boilerplate](https://visualstudiogallery.msdn.microsoft.com/6cf50a48-fc1e-4eaf-9e82-0b2a6705ca7d): Rich templates for ASP.NET Core MVC.
 * [MyTested.AspNetCore.Mvc](https://github.com/ivaylokenov/MyTested.AspNetCore.Mvc): Powerful fluent testing framework for ASP.NET Core MVC.
 * [MvcDeviceDetector](https://github.com/laskoviymishka/MvcDeviceDetector): Device detection mechanism to create mobile web applications.
+* [XmlResult](https://github.com/Wallsmedia/XmlResult): XML formatter extensions to allow defining the XML serializer type.
 
 This project is part of ASP.NET Core. You can find samples, documentation and getting started instructions for ASP.NET Core at the [Home](https://github.com/aspnet/home) repo.