Update quickstart.rst (#622)
Update quickstart.rst (#622)

Current code sample doesn't build (CreateUsingRabbitMQ should be CreateUsingRabbitMq).  Also, it doesn't work due to bus.Stop() executing faster than the message can be handled.  A Console.ReadKey fixes this.

Former-commit-id: 400a5a58f40ca894f5defd98982e959d0d9d9e22
MassTransit/MassTransit,phatboyg/MassTransit,MassTransit/MassTransit,SanSYS/MassTransit,SanSYS/MassTransit,phatboyg/MassTransit,jacobpovar/MassTransit,jacobpovar/MassTransit