Document location of prebuilt static libraries

[lugehorsam]

The docs mention the existence of prebuilt libraries but not where to find them.

My use case is linking to this project via Bazel rather than using CMake.

[drubinstein]

The libraries we use can be found in the libraries directory.
https://github.com/spotify/NFHTTP/tree/master/libraries

[lugehorsam]

Ah, I thought from this line NFHTTP is a Cmake project, while you are free to download the prebuilt static libraries...(etc) that NFHTTP itself came in a prebuilt form.

Not needed anymore for me since the Bazel idiom is to build from source anyway.