docs: Add user documentation about audio support

This introduces plain-text documentation about the audio test, aimed at
users who wish to setup and run the audio tests.

Given the contents of this documentation, it felt more relevant to make
it part of the tree instead of the API reference.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

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