Added formula for OpenAL Soft project

OpenAL Soft is a cross-platform software implementation of OpenAL that is useful for game developers who want a consistent cross-platform audio layer.

http://kcat.strangesoft.net/openal.html
OpenAL Soft is a developer library, not a binary, so I'm not sure what test would be appropriate. I've looked at a number of developer libraries and not seen any tests that I can replicate. Is there an example of a test for a developer library formula?