add doc for VERA chip
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# VERA
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this is a video and sound generator chip used in the Commander X16, a modern 8-bit computer created by The 8-Bit Guy.
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it has 16 channels of pulse/triangle/saw/noise and one stereo PCM channel.
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currently Furnace does not support the PCM channel's stereo mode, though.
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# effects
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- `20xx`: set waveform. the following values are accepted:
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- 0: pulse
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- 1: saw
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- 2: triangle
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- 3: noise
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- `22xx`: set duty cycle. `xx` may go from 0 to 3F.
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