Adding Font Awesome to WP Plugin

Did you create wp-plug-in/wp-plug-in.php file in plugins folder and added this following code.

<?php
/**
 * Plugin Name: Load FontAwesome
 * Version:     1.0
 */

/* Exit if accessed directly */
if ( ! defined( 'ABSPATH' ) ) exit;

function wp_styles() {
    wp_register_style( 'font-awesome', plugins_url( 'wp-plug-in/css/font-awesome.min.css' ) );
    wp_enqueue_style( 'font-awesome' );
}
add_action( 'wp_enqueue_scripts', 'wp_styles' ); 

And added font awesome css and fonts in wp-plug-in/css folder?
And then activate this plugin from admin panel?

Can you not see font-awesome.min.css file in website source code? Search for it?