Create your own library, like WPILib?

[The Doctor]

I am writing a library, which contains all the stuff my team needs but isn't in WPILib, like integer mapping, threaded timers, and inverse kinematics for mecanum wheel drive. I would like to include it in the standard include directory, so i can simply do an

#include <MRTLib.h>

at the top of my C++ program and get my library. How do i do this?

I have already created a header and cpp file, which work already.