Add cmake config file generation

[Cyberunner23]

It would be very nice if cURL would support config file packages so that people using cmake can easily incorporate cURL in their project. Incrporating cURL into a project would look something like:

find_package(curl CONFIG REQUIERD)
add_executable(proj-using-curl ${SOURCE})

# "curl::" is a namespace
target_link_libraries(curl::curl)

Some examples can be found here.

[bagder]

Asking for someone to do work for you here is not fruitful. This is an issue tracker for problems people are having. The best way to get a feature added that you miss is to get started on it and then reach out for help from the wider community, either on the curl-library mailing list or perhaps by submitting a first pull-request and asking for feedback, comments or help.