Send "Welcome Email" for newly created users

When I create a new internal user on the Security page, I'd like to be able to press a button to send them a welcome email with their login info, username, password, links, documentation, etc. Much in the same way that we can customize and send Host Pass and Meeting emails, I'd like to send emails on new user creation.

Ideally this would be an optional email, one that I can send manually with a button or by checking a "Send welcome email" checkbox when creating the user. I don't necessarily want every created user to get this email.

Thank you!