add bullet at the beginning of the line in TinyMCE

I have to configure TinyMCE for my web tool, but I've stuck. I need to create next feature: when user press enter (creates a new line) bullet(simple bullet, like in tag) should appeared automatically at the beginning of the new line and this should be done in TinyMCE. Does anybody has an idea how to do this? Is there any properties in TinyMCE or it's better to use pure JS with regexp?

Thank in advance for help! :)