Updated readme

Author: FlorianRappl

README.md

@@ -6,6 +6,7 @@
 [![GitHub Tag](https://img.shields.io/github/tag/AngleSharp/AngleSharp.Xml.svg?style=flat-square)](https://github.com/AngleSharp/AngleSharp.Xml/releases)
 [![NuGet Count](https://img.shields.io/nuget/dt/AngleSharp.Xml.svg?style=flat-square)](https://www.nuget.org/packages/AngleSharp.Xml/)
 [![Issues Open](https://img.shields.io/github/issues/AngleSharp/AngleSharp.Xml.svg?style=flat-square)](https://github.com/AngleSharp/AngleSharp.Xml/issues)
+[![Gitter Chat](http://img.shields.io/badge/gitter-AngleSharp/AngleSharp-blue.svg?style=flat-square)](https://gitter.im/AngleSharp/AngleSharp)
 [![StackOverflow Questions](https://img.shields.io/stackexchange/stackoverflow/t/anglesharp.svg?style=flat-square)](https://stackoverflow.com/tags/anglesharp)
 [![CLA Assistant](https://cla-assistant.io/readme/badge/AngleSharp/AngleSharp.Xml?style=flat-square)](https://cla-assistant.io/AngleSharp/AngleSharp.Xml)
 
@@ -41,6 +42,16 @@ Participation in the project is highly welcome. For this project the same rules
 
 If you have any question, concern, or spot an issue then please report it before opening a pull request. An initial discussion is appreciated regardless of the nature of the problem.
 
+Live discussions can take place in our [Gitter chat](https://gitter.im/AngleSharp/AngleSharp), which supports using GitHub accounts.
+
+This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community.
+
+For more information see the [.NET Foundation Code of Conduct](https://dotnetfoundation.org/code-of-conduct).
+
+## .NET Foundation
+
+This project is supported by the [.NET Foundation](https://dotnetfoundation.org).
+
 ## License
 
 The MIT License (MIT)