You would definitely need to add a graphics card as well though. The i3-2100 only include Intel's HD Graphics 2000 integrated GPU, while the minimum requirements call for at least HD 4000, a graphics chipset that should be somewhere around 3 times as fast, and that's for low settings and resolution.
Do you happen to have another computer available already? If so, list its hardware specs. It might be possible to just add a cheap graphics card to it to allow it to run the game.