added readme file

Author: manchumahara

README.txt

@@ -0,0 +1,64 @@
+=== CBX PhpSpreadSheet Library ===
+Contributors: codeboxr,manchumahara
+Donate link: https://codeboxr.com
+Requires at least: 3.5
+Tested up to: 5.2
+Stable tag: 1.0.0
+License: GPLv2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+
+Open source PhpSpreadSheet php library released as wordpress plugin to use easily
+
+== Description ==
+
+A pure [PHP library for reading and writing spreadsheet files](https://phpspreadsheet.readthedocs.io)
+
+From Codeboxr we wrapped the library as wordpress plugin to easy distribute as wordpress plugin. WordPress now doesn't allow this type library as
+plugin but providing a large php package with plugin makes the plugin heavy and troublesome for updates. We hosted this in github so that user can download and later
+update easily.
+
+Software requirements
+
+The following software is required to develop using PhpSpreadsheet:
+
+ * PHP version 5.6 or newer
+ * PHP extension php_zip enabled
+ * PHP extension php_xml enabled
+ * PHP extension php_gd2 enabled (if not compiled in)
+
+
+The plugin check php version, php_zip, php_xml and php_gd2 library compatible or installed or not, based on success it activated.
+
+How to use:
+
+`
+if ( defined('CBXPHPSPREADSHEET_PLUGIN_NAME') && file_exists( CBXPHPSPREADSHEET_ROOT_PATH . 'lib/vendor/autoload.php' ) ) {
+	//Include PHPExcel
+	require_once( CBXPHPSPREADSHEET_ROOT_PATH . 'lib/vendor/autoload.php' );
+
+	//now take instance
+	$objPHPExcel = new \PhpOffice\PhpSpreadsheet\Spreadsheet();
+
+	//do whatever you need todo
+}
+`
+
+== Installation ==
+
+1. Download the latest zip from here (https://github.com/codeboxrcodehub/cbxphpspreadsheet/releases)
+2. [WordPress has clear documentation about how to install a plugin].(https://codex.wordpress.org/Managing_Plugins)
+3. After install activate the plugin "CBX PhpSpreadSheet Library" through the 'Plugins' menu in WordPress
+4. This plugin doesn't load any library by default, it doesn't create extra folder or menu.
+
+
+
+
+
+== Screenshots ==
+
+1. yet to come
+
+== Changelog ==
+
+= 1.0 =
+* First public release