Add nuget support

[niclaslindstedt]

Create a new NuGet:

etimo nuget new IdentityExtensions [--example-api] [--example-console]

Creates a new nuget named Etimo.IdentityExtensions with a boilerplate folder structure with tests and example project. The --example-api and --example-console arguments determines what sort of example project we should use.

List our nuget packages:

etimo nuget list

Push a nuget package:

etimo nuget push IdentityExtensions

Pushes the Etimo.IdentityExtensions to our Etimo NuGet organization.

The NuGet token is fetched from the Etimo intranet.