It would be cool to be able to also add created files to CMakeLists.txt (since it is the most modern build system).
For example, if an executable application is created, it would edit add_executable to add the created .h/.cc there, or other ways to add itself to the build configuration.

Simplest example of an idea:

add_executable(project 
 main.cc
)

to

add_executable(project 
 main.cc
 newClass.h
 newClass.cc
)

This can be made an optional and customizable option (e.g., if creating a library rather than an executable application)