add launcher to Ubuntu Unity dock

1) Create file "~/.local/share/applications/YOUR_NAME.desktop"

2) Add following entries to the file

[Desktop Entry]

Name=YOUR NAME

Comment=YOUR COMMENT

Exec=/PATH/TO/COMMAND

Icon=/PATH/TO/ICON

Terminal=false

Type=Application

StartupNotify=true

3) Drag the file to the dock (you may need to use Ctrl+H in Nautilus to show hidden files). Alternatively, log out and log in to restart Unity, but I found that this doesn't always work.