As Usman says, there isn't - as far as I am aware - an existing feature that does this.
However, you could ask in the General developer forum about using Moodle's events system to trigger an email to users. There are other systems within Moodle that trigger notifications (e.g. a user gets notified when a grader marks their assignment), so you could a) find the relevant trigger event when a course is created and b) find how that can be used to send a notification to users - You would probably use the Moodle notification system ratehr than simply an email, because that already has the relevant systems for sending that to both Moodle internal messaging and to emails.
Alternatively you could advertise for a developer to do this for you. I think the tools are all there within Moodle, so it's 'just' a case of putting them together in the right ways - that said, the 'just' here would be outside my immediate experience and expertise, so I may be wrong about the complexity of achieving this!