Shutdown shortcut is included in  Windows System but if you want to built in your own, follow the rest of my post.

• Right Click on the Desktop or screen and choose NEW > SHORTCUT
• Under the " Create Shortcut" option type " shutdown -s -t 0 -f ". then Click the Next button.
• On the Next step, you are going to type title for the program. Type " Shutdown.exe" or your desire name. Hit Finish
• To make it real , right click again the Shutdown Shortcut you are created and choose PROPERTIES>CHANGE ICON> FIND THE ICON WITH THE SAME APPEARANCE OF SHUTDOWN IN START MENU>APPLY.
• Now you can use that Shortcut Shutdown . For only one click it will shutdown your PC.

If you want to know what is the function of each key, you can see below.

• s is the parameter used to shutdown the computer
• t is Set timeout for shutdown to seconds.
• f is forced running application to close without warning.
• 0 we put zero to for quick shutdown.