There are many variables to look at when installing keyless go (especially aftermarket) when it comes to a car like this.
You'll save time and money by having bought a car that has the system in it.
Various modules will need to be installed, ignition switch installed, interior will all need to come out for running wires and installing all needed components... if you have someone else do this, you'll run some high labor costs.
Forget going to the dealer and having them do it, the price will be through the roof, if they even agree to do so.
If you do it yourself, good luck! However, considering how new your vehicle still is (likely qualifies as a CPO vehicle from a dealer), there is no reason to tear into it for this feature.
Ultimately, it's your choice. Either way, we hope you enjoy your new ride, no matter what features it has!