$ touch /usr/share/applications/robomongo.desktop
$ vim /usr/share/applications/robomongo.desktop
[Desktop Entry]
Encoding=UTF-8
Type=Application
Name=Robomongo
Icon=/opt/robomongo-{robomongo-version}/bin/robomongo.png
Exec="/opt/robomongo-{robomongo-version}/bin/robomongo"
Comment=Robomongo desktop entry
Categories=Development;
Terminal=false
StartupNotify=true
You can get the icon from here:
wget https://raw.githubusercontent.com/Studio3T/robomongo/master/src/robomongo/gui/resources/icons/logo-256x256.png