This way will help you keep watching Drupal coding standards while you're writing your code inside your Atom editor.
// Make sure you have composer installed in your machine.
// Then run this command.
composer global require drupal/coder
// Add this line in ~/.bashrc file to make sure everytime you turn on your machine it will be executed.
// You can verify this has worked with:
// Copy (Drupal) and (DrupalPractice) folders to (Standards) folder or just make a symbolic link.