If you're new to developing for the Hololens 2, you should start with the fabulous MRTK. However, MRTK (which includes over 60,000 lines of code) feels like extreme overkill if all you really want is some hands.
This project provides a Hands prefab that will work with HL2 hand tracking using OpenXR. These hands will also work in the Unity editor through Holographic Remoting for Play Mode.
