Add a New line button for another fingering row.

Each line keeps its own charts and staff. Save PNG stacks every line. Version 0.2.3.

Co-authored-by: catpersonisme <catpersonisme@gmail.com>

README.md

@@ -7,17 +7,17 @@ The usual way to run it is one Linux AppImage. That file contains the window and
 ## Run the AppImage
 
 ```bash
-chmod +x Recorder-Tab-Converter-0.2.2.AppImage
-./Recorder-Tab-Converter-0.2.2.AppImage
+chmod +x Recorder-Tab-Converter-0.2.3.AppImage
+./Recorder-Tab-Converter-0.2.3.AppImage
 ```
 
 If the file will not start because FUSE is missing:
 
 ```bash
-APPIMAGE_EXTRACT_AND_RUN=1 ./Recorder-Tab-Converter-0.2.2.AppImage
+APPIMAGE_EXTRACT_AND_RUN=1 ./Recorder-Tab-Converter-0.2.3.AppImage
 ```
 
-Open **Empty line**, or start from **Twinkle, opening** or **Ode, held note**. Drag any chart from C5 to D7, or drag **Rest** or **Space**, onto the line. Drag a placed item to move it. Choose a duration under it. Remove takes it off. **Shorter**, **Taller**, **Narrower**, **Wider**, and the corner grip change the line box. **Save PNG** downloads the finished row.
+Open **Empty line**, or start from **Twinkle, opening** or **Ode, held note**. Drag any chart from C5 to D7, or drag **Rest** or **Space**, onto a line. Drag a placed item to move it, including onto another line. **New line** adds a row underneath. Plus and minus change the length. Remove takes an item off. **Shorter**, **Taller**, **Narrower**, **Wider**, and the corner grip change the box. **Save PNG** downloads every line.
 
 ## Build the AppImage
 
@@ -30,7 +30,7 @@ From a checkout, one command:
 That installs Node packages, builds the app, and writes:
 
 ```text
-dist/Recorder-Tab-Converter-0.2.2.AppImage
+dist/Recorder-Tab-Converter-0.2.3.AppImage
 ```
 
 The AppImage is not committed. Keep it under 600MB.