Client CPT

<?php
add_action('init', 'ccd_clients');

function ccd_clients() {

    $labels = array(
        'name' => _x('Clients', 'post type general name'),
        'singular_name' => _x('Client', 'post type singular name'),
        'add_new' => _x('Add New', 'ccd_portfolio item'),
        'add_new_item' => __('Add New Client'),
        'edit_item' => __('Edit Client'),
        'new_item' => __('New Client'),
        'view_item' => __('View Client'),
        'search_items' => __('Search Clients'),
        'not_found' =>  __('Nothing found'),
        'not_found_in_trash' => __('Nothing found in Trash'),
        'parent_item_colon' => ''
    );

    $args = array(
        'labels' => $labels,
        'public' => true,
        'publicly_queryable' => true,
        'show_ui' => true,
        'query_var' => true,
        'menu_icon' => get_stylesheet_directory_uri() . '/images/icons/plugins/clients.png',
        'capability_type' => 'post',
        'hierarchical' => false,
        'menu_position' => null,
        'supports' => array('title', 'editor', 'excerpt'),
        'can_export' => true,
        'show_in_menu' => true,
        'has_archive' => false
      );

    register_post_type( 'clients' , $args );
    flush_rewrite_rules();
}
?>