With the Ionic CLI:

Take the name after ionic2-starter-, and that is the name of the template to be used when using the ionic start command below:

$ sudo npm install -g ionic cordova
$ ionic start mySideMenu sidemenu

Then, to run it, cd into mySideMenu and run:

$ ionic cordova platform add ios
$ ionic cordova run ios

Substitute ios for android if not on a Mac.