Article Post Type Creation

// Register Custom Post Type
function create_app_post_type() {

	$labels = array(
		'name'                  => 'Applications',
		'singular_name'         => 'Application',
		'menu_name'             => 'Applications',
		'name_admin_bar'        => 'Application',
		'archives'              => 'Application Archives',
		'attributes'            => 'Application Attributes',
		'parent_item_colon'     => '',
		'all_items'             => 'All Applications',
		'add_new_item'          => 'Add New Application',
		'add_new'               => 'Add New',
		'new_item'              => 'New Application',
		'edit_item'             => 'Edit Application',
		'update_item'           => 'Update Application',
		'view_item'             => 'View Application',
		'view_items'            => 'View Applications',
		'search_items'          => 'Search Application',
		'not_found'             => 'Not found',
		'not_found_in_trash'    => 'Not found in Trash',
		'featured_image'        => 'Featured Image',
		'set_featured_image'    => 'Set featured image',
		'remove_featured_image' => 'Remove featured image',
		'use_featured_image'    => 'Use as featured image',
		'insert_into_item'      => 'Insert into Application',
		'uploaded_to_this_item' => 'Uploaded to this Application',
		'items_list'            => 'Applications list',
		'items_list_navigation' => 'Applications list navigation',
		'filter_items_list'     => 'Filter Application list',
	);
	$capabilities = array(
		'edit_post'             => 'edit_application',
		'read_post'             => 'read_application',
		'delete_post'           => 'delete_application',
		'edit_posts'            => 'edit_applications',
		'edit_others_posts'     => 'edit_others_applications',
		'publish_posts'         => 'publish_applications',
		'read_private_posts'    => 'read_private_applications',
	);
	$args = array(
		'label'                 => 'Application',
		'description'           => 'Corresponds to root node in a website.',
		'labels'                => $labels,
		'supports'              => array( 'title', 'thumbnail', 'comments', 'revisions', 'custom-fields', 'post-formats' ),
		'taxonomies'            => array( 'category', 'post_tag' ),
		'hierarchical'          => false,
		'public'                => true,
		'show_ui'               => true,
		'show_in_menu'          => true,
		'menu_position'         => 5,
		'menu_icon'             => 'dashicons-admin-site',
		'show_in_admin_bar'     => true,
		'show_in_nav_menus'     => true,
		'can_export'            => true,
		'has_archive'           => false,
		'exclude_from_search'   => false,
		'publicly_queryable'    => true,
		'query_var'             => 'application',
		'capabilities'          => $capabilities,
		'show_in_rest'          => true,
		'rest_controller_class' => 'WP_REST_Applications_Controller',
	);
	register_post_type( 'application', $args );

}
add_action( 'init', 'create_app_post_type', 0 );