Subscription Widget Helper

[thinkingserious]

	Create a helper that will show how to add a working subscription widget to their site from code in the library.
	
	
	Features:
	
	
	- An function that returns an embeddable HTML form that takes email address and name.
	
	- The form should submit to a customizable URL path
	
	- The code at the URL path should accept the data and post it to the contactdb using the (POST Add Recipients endpoint)[https://sendgrid.com/docs/API_Reference/api_v3.html#contacts-api-recipients]
	- Please add tests:
	  - Validate the form is built properly
	  - Validate that a proper response is received when data is submitted from the form

[kraigh]

I will work on this!

[kraigh]

^ Please see my notes in the PR. Does this solution make sense @thinkingserious ?

[thinkingserious]

Since there has been no activity on this issue since March 1, 2020, we are closing this issue. Please feel free to reopen or create a new issue if you still require assistance. Thank you!