Wire up Subscribe Form

[ry4-n]

A subscribe component exists already under src/app/home-page/newsletter-subscribe. We need to wire this up to an Angular Service called "ContactService".

• Scaffold out ContactService using CLI.
• ContactService should exist in the src/app/shared directory.
• Create a method called createSubscriber that accepts an object.
• The method should use http service and call post with appropriate parameters to create a new subscriber. (Note, the API endpoint does not currently exist)
• The ContactService should also have a "getSubscribers" method that use the http service to call the API end point. (Note, the API endpoint does not currently exist)