Add musician-friendly demo guide

README.md

@@ -34,6 +34,49 @@ reference.
 
 ![VocalRender overview](https://raw.githubusercontent.com/pymaster17/VocalRender/main/assets/intro.png)
 
+## For musicians: try it without writing code
+
+You do not need to understand machine learning or install the model to try
+VocalRender. Open the **[online VocalRender demo](https://huggingface.co/spaces/pymaster/VocalRender-demo)**
+and work with familiar score formats in your browser.
+
+### What VocalRender does
+
+VocalRender sings a melody that you provide. You choose the lyrics, notes,
+rhythm, tempo, and a short voice reference; the model renders them as a singing
+voice. It is a score renderer rather than an automatic composer: it does not
+write the melody or arrange an accompaniment for you.
+
+### What to prepare
+
+- **A melody:** paste ABC notation, upload an ABC file, or upload MusicXML from
+  notation software such as MuseScore. You can also enter notes manually.
+- **Chinese lyrics:** embedded ABC `w:` or MusicXML lyrics can be imported. If
+  the score has no note-aligned lyrics, type or paste them in the lyrics box.
+- **A voice reference:** select one of the included voices, or upload 2–8
+  seconds of clean, unaccompanied singing that you have permission to use. The
+  clip supplies the vocal color; it does not need to be the same song.
+
+### Score-to-song workflow
+
+1. Open **Import ABC notation or MusicXML**, provide your score, and press
+   **Parse score**.
+2. Check the suggested vocal part, lyric line, and measure range. The demo
+   preselects a short range that fits the model; you can change it.
+3. Press **Load selected range into editor**. Review the lyrics, pitches,
+   durations, and BPM, then press **Generate Singing**.
+
+In the editor, MIDI pitch `60` means middle C (`C4`), and pitch `0` means a
+rest. **+ Melisma note** lets one lyric syllable continue across multiple
+notes. `SP` represents a rest or breath.
+
+The released checkpoint currently works best with Mandarin Chinese and a
+single vocal melody. Chord names in ABC, such as `"C"` or `"G7"`, are treated
+as accompaniment labels and ignored, but actual simultaneous notes are not
+supported. For piano or ensemble scores, select a monophonic vocal/melody part.
+The demo reports unsupported passages instead of silently guessing which note
+should be sung.
+
 ## How it works
 
 VocalRender combines three components: