renaming files to be more consistent with the example name of the plugin

related #48

plugin-name/plugin-name.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * The WordPress Plugin Boilerplate.
+ *
+ * A foundation off of which to build well-documented WordPress plugins that also follow
+ * WordPress coding standards and PHP best practices.
+ *
+ * @package PluginName
+ * @author  Your Name <email@example.com>
+ * @license GPL-2.0+
+ * @link    TODO
+ *
+ * @wordpress-plugin
+ * Plugin Name: TODO
+ * Plugin URI: TODO
+ * Description: TODO
+ * Version: 1.0.0
+ * Author: TODO
+ * Author URI: TODO
+ * Author Email: TODO
+ * Text Domain: plugin-name-locale
+ * License: GPL-2.0+
+ * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
+ * Domain Path: /lang/
+ */
+
+// If this file is called directly, abort.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+// TODO: replace `class-plugin-boilerplate.php` with the name of the actual plugin's class file
+require_once( plugin_dir_path( __FILE__ ) . 'class-plugin-boilerplate.php' );
+
+// Register hooks that are fired when the plugin is activated, deactivated, and uninstalled, respectively.
+// TODO: replace PluginName with the name of the plugin defined in `class-plugin-boilerplate.php`
+register_activation_hook( __FILE__, array( 'PluginName', 'activate' ) );
+register_deactivation_hook( __FILE__, array( 'PluginName', 'deactivate' ) );
+
+// TODO: replace PluginName with the name of the plugin defined in `class-plugin-boilerplate.php`
+PluginName::get_instance();