Added get_gravatar function and README file

Author: omkartapale

README.md

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+
+Gravatar Helper Spark for CodeIgniter
+============================
+
+[Gravatar](http://gravatar.com) Helper functions to utilize with [CodeIgniter](http://codeigniter.com) 2.x and 3.x or Standard PHP Application.
+
+
+Usage
+-------------------------------------
+
+1. Copy `gravatar_helper.php` to your `application/helpers` folder.
+2. Autoload the helper in `application/config/autoload.php`: $autoload['helper'] = array('gravatar');
+3. Use helper functions as needed.
+
+
+Examples
+-------------------------------------
+
+	/**
+     * Get either a Gravatar URL or complete image tag for a specified email address.
+     *
+     * @param string $email The email address
+     * @param int $s Size in pixels, defaults to 80px [ 1 - 2048 ]
+     * @param string $d Default imageset to use [ 404 | mm | identicon | monsterid | wavatar ]
+     * @param string $r Maximum rating (inclusive) [ g | pg | r | x ]
+     * @param bool $img True to return a complete IMG tag False for just the URL
+     * @param array $atts Optional, additional key/value attributes to include in the IMG tag
+	 * @return String containing either just a URL or a complete image tag
+	 */
+
+	<?php echo gravatar( '[email protected]', 180 )?>
+	
+  	
+License
+-------------------------------------
+
+© 2016 Omkar Tapale. All Rights Reserved.
+
+Released under the MIT License: [http://www.opensource.org/licenses/mit-license.php](http://www.opensource.org/licenses/mit-license.php)
+
+
+

helpers/gravatar_helper.php

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+<?php
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/**
+ * CodeIgniter Gravatar Helper
+ *
+ * Gravatar Helper functions to utilize with Codeigniter 2.x and 3.x
+ * or Standard PHP Application.
+ *
+ * @package		CodeIgniter Gravatar
+ * @subpackage	Helpers
+ * @category	Helpers
+ * @author		Omkar Tapale
+ * @copyright   2016 Omkar Tapale
+ * @license     MIT
+ * @license     http://www.opensource.org/licenses/mit-license.php
+ * @version     v1.0.0
+ *
+ * The latest version of CodeIgniter Gravatar Helper can be obtained from:
+ * https://github.com/omkartapale/CodeIgniter-Gravatar-Helper
+ */
+
+
+if (!function_exists('get_gravatar')) {
+
+    /**
+     * Get either a Gravatar URL or complete image tag for a specified email address.
+     *
+     * @param string $email The email address
+     * @param int $s Size in pixels, defaults to 80px [ 1 - 2048 ]
+     * @param string $d Default imageset to use [ 404 | mm | identicon | monsterid | wavatar ]
+     * @param string $r Maximum rating (inclusive) [ g | pg | r | x ]
+     * @param bool $img True to return a complete IMG tag False for just the URL
+     * @param array $atts Optional, additional key/value attributes to include in the IMG tag
+     * @return String containing either just a URL or a complete image tag
+     * @source http://gravatar.com/site/implement/images/php/
+     */
+    function get_gravatar( $email, $s = 80, $d = 'mm', $r = 'g', $img = false, $atts = array() ) {
+        $url = 'http://www.gravatar.com/avatar/';
+        $url .= md5( strtolower( trim( $email ) ) );
+        $url .= "?s=$s&d=$d&r=$r";
+        if ( $img ) {
+            $url = '<img src="' . $url . '"';
+            foreach ( $atts as $key => $val )
+                $url .= ' ' . $key . '="' . $val . '"';
+            $url .= ' />';
+        }
+        return $url;
+    }
+}