chore: add README

README.md

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+# lrcfetch
+
+A CLI tool for fetching LRC lyrics on Linux. Automatically detects the currently playing track via MPRIS/DBus and retrieves synced or plain lyrics from multiple sources.
+
+## Sources
+
+Lyrics are fetched using a fallback pipeline (first synced result wins):
+
+1. **Local** — sidecar `.lrc` files or embedded audio metadata (FLAC, MP3)
+2. **Spotify** — synced lyrics via Spotify's API (requires `SPOTIFY_SP_DC`)
+3. **LRCLIB** — exact match from [lrclib.net](https://lrclib.net) (requires full metadata)
+4. **LRCLIB Search** — fuzzy search from lrclib.net (requires at least a title)
+5. **Netease** — Netease Cloud Music public API
+
+## Usage
+
+```bash
+# Fetch lyrics for the currently playing track
+lrcfetch fetch
+
+# Search by metadata (bypasses MPRIS)
+lrcfetch search -t "Song Title" -a "Artist"
+
+# Export to .lrc file
+lrcfetch export
+
+# Force a specific source
+lrcfetch fetch --method spotify
+
+# Cache management
+lrcfetch cache --stats
+lrcfetch cache --query
+lrcfetch cache --clear
+```
+
+## Configuration
+
+Set `SPOTIFY_SP_DC` via environment variable or `.env` file:
+
+- `~/.config/lrcfetch/.env` — user-level
+- `.env` in working directory — project-local
+- Shell environment — highest priority
+
+```env
+SPOTIFY_SP_DC=your_cookie_value
+```