For some reason, it doesn't properly add an icon when running Windows 8+.
Using Windows Explorer, navigate to:
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Visual Studio 2013
In that folder, you'll see a shortcut named
Visual Studio Tools that maps to (assuming default installation):
C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\Tools\Shortcuts
Double-click the shortcut (or go to the folder above). From that folder, copy the shortcut named
Developer Command Prompt for VS2013 (and any others you find useful) to the first directory (for the Start Menu). You'll likely be prompted for administrative access. Once you've done that, you'll now have an icon available for the 2013 command
prompt.