Here is some information from the Fallout Wiki page about it for some context.

Serving as a prologue to Fallout: New Vegas, the book was released with the Collector’s Edition of the game on October 19, 2010. Dark Horse released a digital version of the book on November 16, 2011 on Dark Horse Digital and its iTunes app for $2.99. Chris Avellone described the storyline as “showcasing the cast, locations in the game, and provides more backstory on some of the major characters. It leads right up to the opening movie of the game, and provides context for the initial set-up and the motivations for some of the major adversaries.”

The events take place in the week before the game’s begin date, and Avellone explained that the Courier was not included in the storyline, as the team “wanted the players to determine how their character looks, acts, and reacts so in the book we focused on the player’s adversaries and the folks who want you dead.”

Avellone’s previous experience in comics includes five stories for Dark Horse’s Star Wars Tales anthology comic and Clone Wars Adventures digest comic.

It’s worth noting this comic isn’t completely canon. Horses appear in the comic and both Chris Avellone and Joshua Sawyer said their inclusion was an error.

The comic was also uploaded to Imgur; I would have linked to that instead but the website appears to be down. I am not the one who uploaded either of these.