Reorganize the README and add some more audio troubleshooting steps.
Reorganize the README and add some more audio troubleshooting steps.

Bug: 35672904

Change-Id: I0cdc78ae97f2d023f892f0845a896f5d41e709c2

GitOrigin-RevId: 783044b3ff26df8637db48c3a38dca858a14668d

googlesamples/assistant-sdk-python