Add help text to readme

README.md

@@ -1 +1,28 @@
-# id3spot
+# id3spot
+
+```
+Usage: id3spot.py [OPTIONS] [FILES]...
+
+Options:
+  -q, --query TEXT   Specify a query to use when searching for a matching
+                     track.
+  -r, --replace      Replace original tags entirely
+  -R, --rename TEXT  Rename file (the extension is not affected) based on data
+                     in the tag using substitution variables: $album,
+                     $album_artist, $artist, $best_date,
+                     $best_date:prefer_recording,
+                     $best_date:prefer_recording:year,
+                     $best_date:prefer_release,
+                     $best_date:prefer_release:year, $best_date:year,
+                     $disc:num, $disc:total, $file, $file:ext,
+                     $original_release_date, $original_release_date:year,
+                     $recording_date, $recording_date:year, $release_date,
+                     $release_date:year, $title, $track:num, $track:total
+  -a, --analyze      Include ID3 tags for bpm and key from Spotify.
+  -d, --dry-run      Perform lookup but do not write tags.
+  -x, --magic        Shortcut for id3spot.py -arpR "$artist - $title"
+  -p, --prompt       If song is not exact match, prompt before using
+                     information.
+  -v, --verbose      Output diff for each file processed.
+  --help             Show this message and exit.
+```