How to create launcher for wxMacmolplt

Download the wxmacmolplt icon from here

and paste it to the wxmacmolplt folder
 
Now go to the terminal

Type sudo gedit /usr/share/application/wxmacmolplt.desktop

Then copy and paste following to it

[Desktop Entry]
Name=wxmacmolplt
Comment=Gamess vizualizer
Exec=wxmacmolplt
Icon=/home/crlc/wxmacmolplt-7.7/wxmacmolplt.7.7.png
Terminal=false
Type=Application
Categories=Work
OnlyShowIn=Unity

Save it and close

and go the terminal again and type

sudo chown -R (username):(username) (icon file name).desktop

Another way to do it

As the previous posts mentioned you can very well create own shortcut for Slingshot manually but it is worth to mention that there is good, working software to do it with gui, as well as manage your application shortcuts.
The software is called Main Menu (alacarte) and can be downloaded from ubuntu repositories.

sudo apt-get install alacarte

then go to terminal type alcarte

and go to new item
set the command as wxmacmolplt
set the launcher