Add subscription message indicating that a subscription was established

[taylorjdawson]

Use Case:

• Users want to know when they successfully subscribe to an event. Let's tell them!

Requirements:

• Determine if this should be a console.log/info or if it should be a callback or if it should be a state variable?

• Once a subscription is established use console.info to indicate that the subscription was successfully established.

• Add tests

Acceptance Criteria:

• All tests pass