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README.md

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+# Playback
+
+A terminal-based audio player with synchronized transcript viewing and editing.
+
+## Installation
+
+```bash
+make install
+```
+
+## Usage
+
+```bash
+playback audio.mp3                    # Auto-finds transcript (audio.srt)
+playback audio.mp3 -t transcript.srt  # Specify transcript
+```
+
+## Keybindings
+
+| Key | Action |
+|-----|--------|
+| `space` | Play/Pause |
+| `ctrl+j` | Focus transcript |
+| `ctrl+k` | Focus waveform |
+| `q` | Quit |
+| `?` | Toggle help |
+
+**Waveform (focused):**
+- `h/l` or arrows: Seek 5s
+- `H/L`: Seek 30s
+
+**Transcript (focused):**
+- `j/k`: Navigate cues
+- `ctrl+d/u`: Jump 5 cues
+- `g/G`: First/last cue
+- `enter`: Seek audio to cue
+- `i`: Edit in external editor
+
+## Configuration
+
+Config file: `~/.config/playback/config.json`
+
+```json
+{
+  "seek_step_ms": 5000,
+  "big_seek_step_ms": 30000,
+  "volume": 1.0,
+  "editor": "nvim"
+}
+```
+
+Default editor is `vim`.