Content described on this page has not been released yet. Keep in mind that any information described here that does not have a reference is probably speculation.
Holo-Me is the name of the character customisation for the player's commander. It allows players to change their suit, head related features, and cosmetics.
The Holo-Me is a representation hologram of what you're going to look like. It then applies it to your Commander, who is a real person sitting in the chair. The crew that join your ship through telepresence are holograms.
The Holo-Me is part of the upcoming update 2.3 The Commanders.