No folder platforms on Ionic project

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I've done the following steps :

1. create ionic project with command : run ionic start myApp tabs
2. add platform on ionic project with command : ionic platform add ios, ionic platform add android
3. I can't find the platforms folder on my project structure
4. This is my project sructure :
   -bower.json
   -config.xml
   -gulpfile.js
   -hooks
   -ionic.project
   -package.json
   -README.md
   -resources
   -scss
   -www
5. This is my ionic info :

Cordova CLI: 5.4.1

Ionic CLI Version: 1.7.13

Ionic App Lib Version: 0.6.5

ios-deploy version: 1.8.4

ios-sim version: 5.0.6

OS: Mac OS X El Capitan

Node Version: v5.4.1

Xcode version: Xcode 7.2 Build version 7C68

My question :
Where is the platforms folder ?