@lohang It's a bunch of stuff one (usually figuratively) needs to get started on something. I have never seen the expression used outside of a meme, though. Example: “Insomniac starter pack: coffee and movies.” Not a very interesting example, I guess, but I think you can get the meaning.
Also take a look at #StarterPack and #StarterKit hashtags. More people seem to be working on these introductory packages.