Add latest release button

Author: jstewart-amd

README.md

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 AMF is a light-weight, portable multimedia framework that abstracts away most of the platform and API-specific details and allows for easy implementation of multimedia applications using a variety of technologies, such as DirectX 11, OpenGL, and OpenCL and facilitates an efficient interop between them.
 
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+  <a href="https://github.com/GPUOpen-LibrariesAndSDKs/AMF/releases/latest/"><img src="http://gpuopen-librariesandsdks.github.io/media/latest-release-button.svg" alt="Latest release" title="Latest release"></a>
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 ### Prerequisites
 * Windows&reg; 7 (SP1 with the [Platform Update](https://msdn.microsoft.com/en-us/library/windows/desktop/jj863687.aspx)), Windows&reg; 8.1, or Windows&reg; 10
 * Visual Studio&reg; 2013 or Visual Studio&reg; 2015