Pipelines: support ASP.NET Core

I'm new to Docker, and to Pipelines, but we're investing heavily in a new app that is being built from the ground up on ASP.NET Core (RC2, at the moment)

I suggest you add an example to the "getting started" on how to use Pipelines with .NET Core projects. There's a docker image available named microsoft/dotnet that works great (see here ) but it lacks support for Node.