nServiceBus demo and powerpoint slides

Hi Doug,

I have added the nServiceBus demo to the solution - I have included the dependencies in the solution, ie not using NuGet package restore, due to the internet connection problems we were having in the last session.

I have also added the powerpoint file to the repo - this file only includes the slides that I need for the demo, so they will need to be copied into the main slide deck.

Cheers,

Rowan