In the entities section of the customization page you want to browse over to All Links >> Assigned >> Resource, and then make a workflow rule where every time a record is created, there will be an action to email the Resources. You can even customize the email to include any fields that would be relevant.
I have to warn you that this can lead to a massive number of emails, and 9 times out of 10 customers have ended up turning off this customization. I would recommend putting in as many filters as possible to restrict the frequency this rule will be triggered.