title: Where can I find android folder in React Native 0.46.4
body: <p>I'm trying to install several <code>RN libraries</code>.
  Some of them are demand to write code manually in android gradle file or else.</p>
  
  <p>In older version of <code>React Native project</code>, there are <code>android</code> and <code>ios</code> folder of project root, but in my case I can't find them.</p>
  
  <p>I want to write code on </p>
  
  <pre><code>'android/app/build.gradle'
  'android/settings.gradle'
  'MainActivity'.
  </code></pre>
  
  <p><strong>Q:</strong> Where can I find those files?</p>