Missing documentation for using Sol to write Lua C libraries about sol2

[ThePhD]

You're right, we only have 2 requires examples and probably need a basic "Create C library" version of that. This will probably work for that, but I'd need to set up a small CMake app that'll compile this as a static lib and then open it from a library and then make sure it works across lua versions.

One more thing on the list of things to do...

[JRFarmer]

I'd need to set up a small CMake app that'll compile this as a static lib

In my tinkering, I had been compiling my example code as a shared object and let Lua's C library loader find the .so and load it. And of course I'm using CMake to build it. I might clean it up well enough to send you a PR.