Adding additional menu to Gnome 3 panel with custom application launchers

Problem:

• I want to add a customized menu to the Gnome 3 panel.

Solution:

• Install the QuickLaunch Gnome extension
• Create or copy the desired application launchers (.desktop-files) to the directory ~/.local/share/gnome-shell/quicklaunch/
• Following you can find some exemplary application launchers:

[Desktop Entry]
Type=Application
Encoding=UTF-8
Name=portrait
Comment=Screen orientation portrait
Icon=/usr/share/icons/gnome/scalable/devices/computer-apple-ipad-symbolic.svg
Exec=xrandr -o left
Terminal=false
Categories=System;Screen;Rotation

[Desktop Entry]
Type=Application
Encoding=UTF-8
Name=landscape
Comment=Screen orientation landscape
Icon=/usr/share/icons/gnome/scalable/devices/video-display-symbolic.svg
Exec=xrandr -o normal
Terminal=false
Categories=System;Screen;Rotation

[Desktop Entry]
Type=Application
Encoding=UTF-8
Name=onboard
Comment=Show onscreen keyboard
Icon=/usr/share/icons/gnome/scalable/devices/input-keyboard-symbolic.svg
Exec=onboard
Terminal=false
Categories=System;Screen;Keyboard

• Restart the gnome-shell by pressing: ALT+F2 > r > Enter