Hello,

The release of the Virtual Machine Role in Windows Azure Pack and System Center 2012 R2 introduces an application model to deploy virtual machine workloads.

Hand-crafting these packages against the published schemas of the model is a slow and tedious task.

This tool is used to author VM Role artifacts – Resource Definition and Resource Extension Packages.
This tool is used to author consistent VM Role work load gallery content for Windows Azure Pack and Windows Azure.

Creating a Windows Server VM Role Resource Definition

http://www.youtube.com/watch?v=66zznivfh_s

Creating a Windows Server VM Role Resource Extension

http://www.youtube.com/watch?v=iCilD2P8vhE

Creating a Linux VM Role Resource Definition
http://www.youtube.com/watch?v=qrGjA1mYN4M

Creating a Linux VM Role Resource Extension
http://www.youtube.com/watch?v=LdVsmF4GeYE

Updating a Virtual Machine Role Gallery Item

http://www.youtube.com/watch?v=iAm38TMz8RU

Source:

https://vmroleauthor.codeplex.com/releases/view/114215

http://kevingreeneitblog.blogspot.fr/2013/11/download-vm-role-authoring-tool-for.html