Revert "Disabled portaudio."

This reverts commit 310beb781405da7dd95ee91154a5786c3ec41faf.
Revert "Removed README."

This reverts commit a838d251db1b8b01e96ccaaea9a7c77ce7f2352c.
Revert "Revert "Removed README.""

This reverts commit 8eef221c9f6449b9ae01b592dec20e77a6fc23d4.