Library needs more documentation

[Filipp-Druan]

Hello!
I have high hopes for this library. I hope it will be a serious, thorough, long-term project.
Every serious library needs serious documentation. So far it's pretty bad.
Please write docstrings at least for the macros you write. Please!
You can use these tools:
https://github.com/Shinmera/staple
https://github.com/Shinmera/documentation-utils
If need be, I'm willing to put the documentation in a nice way, I'd be very happy to do so. Just please write a description of macros, please.

[bohonghuang]

I will add documentation for manually written APIs in cl-gtk4, but it's important to note that I cannot generate documentation for those dynamically generated GTK APIs because the GObject Typelib does not include documentation-related information.