Add class callable from {Project}.Build.cs

How would I go about adding a class that was callable from the projects Build.cs file? I have created a class that will include/build a relatively generic cmake project durning the build and automatically include its includes directories as well as the libs. I currently have the class in my Build.cs file but would like it to be in its own file so that it can be easily added to any project. (GitHub - caseymcc/UE4CMake: Provides a simple way to add a cmake lib to any Unreal Engine 4 (UE4) proj)