Added an example image of a spectrogram to the README.
- AudioToSpectrogram node: AUDIO input → IMAGE output - Supports Mel and Linear (STFT) spectrograms with dB scaling - 7 colormaps, configurable FFT params and output resolution - torchaudio-based transforms with NumPy STFT fallback Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>