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add AGENTS.md, update README, fix frame in tcd.c

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Implements a command line utility that allows to detect the TRUE quality of your audio material in one batch. Uses psychoacoustics as defined and scientifically proven in:
- ISO/IEC 11172-3:1993 - Coding of moving pictures and associated audio for
digital storage media at up to about 1.5 Mbit/s, Part 3: Audio (MPEG-1
Audio Layer III, "MP3").
- ISO/IEC 13818-7:2006 - Generic coding of moving pictures and associated
audio information, Part 7: Advanced Audio Coding (AAC).
- Zwicker, E. & Fastl, H. - *Psychoacoustics: Facts and Models*, Springer,
1999 (Fletcher–Munson equal-loudness contours).
- Lerch, A. - *An Introduction to Audio Content Analysis*, Wiley, 2012
(spectral features for audio forensics).
Always implement only what is scientifically provable. As it is possible to view on a spectrum analysis of the audio to see the hard cutoff introduced by compression algorithms as MP3, it is possible to tell if we have a 96k MP3 file that just was re-encoded as 320k. This tool should allow to spot exactly that.