How to create a desktop launcher in Gnome Shell

create-gnome-shell-desktop-launcher

1)  In /usr/share/icons create folder SublimeText and move the corresponding icon there (can be a .png)

2)  In /usr/share/applications/sublimetext.desktop create a file called sublimetext.desktop and put in it:

    [Desktop Entry]
    Name=Sublime Text
    Comment=A Sublime way of editing text
    Exec=/opt/sublimetext/sublime_text_3/sublime_text
    Icon=/usr/share/icons/SublimeText/sublimetext-icon.png
    Encoding=UTF-8
    Type=Application
    Categories=Development;

There you go