Add note to docs regarding limitations of IMA ADPCM (WAV) format for seamless audio looping

SDK Feature Requests
22

I'll summarize for people finding this now:

  • adpcm is not great for gapless looping playback, as it's files have a duration that is a multiple of a block size. By micro-adjusting the duration of the source wav file, you might get closer to that multiple.
  • the best chance to get an adpcm output that aligns to the correct length seems to be GitHub - dbry/adpcm-xq: Xtreme Quality IMA-ADPCM Encoder / Decoder . It has to be compiled from source
  • For the convenience of Mac users that tool was wrapped into a Desktop app: ADPCM encoder tool (Mac-only)
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