update readme for ISAR

Usage: ISAR_post_rend [options]

Options:

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Mandatory parameters:

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-i File             : Input File (input file is bitstream if format is BINAURAL_SPLIT_CODED, or PCM/WAV file if format is BINAURAL_SPLIT_PCM)

-if Format          : Input Format of input (BINAURAL_SPLIT_CODED, BINAURAL_SPLIT_PCM)

-im File            : Coded metadata File for BINAURAL_SPLIT_PCM input format

-o File             : Output Audio File in BINAURAL format

-fs                 : Input sampling rate in kHz (48)

-prbfi File         : BFI File

Options:

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-im Files           : Space-separated list of paths to metadata files for BINAURAL_SPLIT_PCM input mode

-fs                 : Input sampling rate in kHz (16, 32, 48) - required only with raw PCM inputs

-T File             : Head rotation trajectory file for simulation of head tracking

-prbfi File         : Split rendering BFI (Bad Frame Indicator) file

-no_delay_cmp       : Turn off delay compensation

-level              : Complexity level, level = (1, 2, 3), will be defined after characterisation.

-q                  : Quiet mode, limit printouts to terminal, default is deactivated

-l                  : List supported audio formats

-fr                 : Set audio rendering frame size

-s File             : Path to the split rendering init params file

The usage of the "ambi_converter" program is as follows:

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