Implement Email Notification of "Quote of the Day"

As a user, I want a daily quote delivered to my email inbox so that I can feel inspired every day.

As a developer, I want to develop a script which sends an email with a randomly generated "Quote of the Day" to subscribed users, so that users receive this email and feel inspired.

Acceptance criteria:

• Script randomly selects a quote from the quotes database.
• Script composes an email with the quote and author.
• Script sends the email to subscribed users only, by reading from the database's user table.