[FEATURE REQUEST]: Add option to include GraphiQL IDE

[go4cas]

The GraphiQL IDE is a great tool for testing GraphQL queries. Could this be included as an option when creating/starting the service?

[brad-decker]

I think this is best left to userland. This library doesn't make assumptions about how the graphql schema will be consumed from the web, so it wouldn't be too hard to add graphiql and use the schema generated by the service (it can be accessed from the gateway instance).