In this post i will give you code of sample plugin file. The sample plugin file should contain plugin header in which you put plugin name and plugin url atleast. You can put GNU license in it also.
The sample plugin file looks like this:-
[code lang=”php”]
<?php
/*
Plugin Name: My Plugin
Plugin URI: http://example.com/wordpress-plugins/my-plugin
Description: A brief description of my plugin
Version: 1.0
Author: Your name
Author URI: http://example.com
License: GPLv2
*/
/* Copyright YEAR PLUGIN_AUTHOR_NAME (email : PLUGIN AUTHOR EMAIL)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
?>
[/code]