AS a USER enrolled in a course, I want to BE ABLE to "mention o tag" another user that belongs to the course in any place where be able to write an info through the WYSIWYG and Moodle would send an email to notify the user was mentioned providing in the body of the email a link to go to the info referenced.

For instance: José is writing a post in a forum and he is talking about the work done by Carlos and John which are a classmates and José decides to "tag or mention" Carlos and John using the syntax "@Carlos Washington y @John Anderson". Exactly like Facebook or Instagram do when you start writing the name with the wysiwyg of someone after the "@".