title: "pod init" giving error "-bash: pod: command not found"
body: <p>I am trying to create a Podfile for my Xcode project for Firebase compatibility, but when I try to create it within the same file that my Xcode project is stored in, using my terminal and typing "pod init", it throws the error "-bash: pod: command not found".</p>
  
  <p>I am up to date on OSX as far as I'm aware, using Sierra 10.12.1, but I am unfamiliar with the use of Podfiles, so any help here would be great, thanks.</p>