It’s on a recorder on one of the pirates. You probably already have it in your inventory. I recommend you get your character up to level 5 at least. The enemies you will confront are significantly above your level but you can do it. The recording is called secret base 1. One of the pirates that attack the mining facility should have dropped it, if not, several other pirates carry it.

"Secret Outpost"

I got it at the beginning, after the Kreet base. I decided to explore the closest outpost on my map and got in a fight with some spacers and one of them dropped it.

Yeah, extra cargo holds are required, default cargo space is not enough, it's a shame you couldn't take anything from the ships you destroyed or cannot do any smuggling missions.