compress API documentation

The patch adds the documentation file explaining the API

Change-Id: I3f44eee1993e7ca910eccbc7d53030050a509706
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Asish Bhattacharya <asishb@codeaurora.org>
1 file changed