[R] Installing littler package on MacOS

[Naresh Gurbuxani]

I just installed littler package on my Mac.  I got the message

 * new binary r installed in bin/ subdirectory                                        
 * consider adding a symbolic link from, e.g., /usr/local/bin                         
 * on OS X, you may have to name this 'lr' instead 

How can I create this link?  

Thanks,
Naresh

PS This is likely a trivial question for experienced Mac users.  I am a novice.