Add example for using the `libuv` repository

[midhunadarvin]

Repository : https://github.com/libuv/libuv

I tried with the following configuration :

CPMAddPackage(
        NAME libuv
        GITHUB_REPOSITORY libuv/libuv
        VERSION 1.48.0
)

and linked it with my target, but it seems the files inside the include folder of libuv are not accessible. Is there any other change that I need to make ?