I'd imagine it would be fairly simple to implement. Excellent idea by the way! We may try and accomplish the same thing.
Just copy the format of the WPILib. You would probably have to import all the files into every project you start, easiest way to do that I'd imagine would just have a folder titled MRTLib, and inside a file MRTLib.h, MRTLib.cpp, and all the other things you'd want to create. Just follow the format of the WPILib
they did pretty well on it!
EDIT: on second thought, you could just add the classes you want into the WPILib! put the files in the WPILib location and add the include into the main WPILib.h file. would make your life a whole lot easier, although you'd have to re-import the classes every year.