I'm just doing the same right now!
I've found
this thread on a German forum (google translate makes it pretty understandable)
You need the 2 new LCI lights (duhhh), and about 2 - 3m of 0.7mm diameter wire (to draw power from the license plate lights to light each of the the LED strips). You can modify the wire harness connectors to fit in the LCI lights.
I think you can get away with no coding, but if you want to change/fix up how the led strips work with the parking lights/brakes then you'll have to code that...