Create a Build vNext build definition

I am going to show how to create a Build.vNext build definition on VSO. Microsoft recently announced the creation of a brand new build system for TFS and VSO at the Connect event last year. This new build system will eventually replace the current one and be much more modular and friendly. Happily I am in the early adopter program and the product team just made an early alfa of the service available for that program and I have been giving it a spin.