Adding AForge.NET and updating Accord.NET text

I would propose adding Accord.NET also to the computer vision section, as this library has equal support for both machine learning and image processing/computer vision.

README.md

@@ -488,6 +488,8 @@ on MNIST digits[DEEP LEARNING]
 
 * [OpenCVDotNet](https://code.google.com/p/opencvdotnet/) - A wrapper for the OpenCV project to be used with .NET applications.
 * [Emgu CV](http://www.emgu.com/wiki/index.php/Main_Page) - Cross platform wrapper of OpenCV which can be compiled in Mono to e run on Windows, Linus, Mac OS X, iOS, and Android.
+* [AForge.NET](http://www.aforgenet.com/framework/) - Open source C# framework for developers and researchers in the fields of Computer Vision and Artificial Intelligence. Development has now shifted to GitHub.
+* [Accord.NET](http://accord-framework.net) - Together with AForge.NET, this library can provide image processing and computer vision algorithms to Windows, Windows RT and Windows Phone. Some components are also available for Java and Android.
 
 <a name="net-nlp" />
 #### Natural Language Processing