Add CoolSMS PHP SDK, and update Composer dependencies

vendor/coolsms/php-sdk/examples/Message/example_sent.php

@@ -0,0 +1,38 @@
+<?php
+/**
+ * #example_sent
+ *
+ * This sample code demonstrate how to check sms result through CoolSMS Rest API PHP
+ * for more info, visit
+ * www.coolsms.co.kr
+ */
+
+use Nurigo\Api\Message;
+use Nurigo\Exceptions\CoolsmsException;
+
+require_once __DIR__ . "/../../bootstrap.php";
+
+// api_key and api_secret can be obtained from www.coolsms.co.kr/credentials
+$api_key = '#ENTER_YOUR_OWN#';
+$api_secret = '#ENTER_YOUR_OWN#';
+
+try {
+    // initiate rest api sdk object
+    $rest = new Message($api_key, $api_secret);
+
+    // set necessary options
+    $options = new stdClass();
+    $options->message_id = 'M52CB443257C61';			//message id 
+    // $options->group_id = 'G52CB4432576C8';		//group id
+    // $options->count = '40';					//result return counts. default is 20
+    // $options->page = '1';					//page 
+    // $options->rcpt = '01012345678';			//search sent result by recipient number
+    // $options->start = '201401070915';		//set search start date  ex) 201401070915
+    // $options->end = '201401071230';			//set search end date	 ex) 201401071230
+
+    $result = $rest->sent($options);
+    print_r($result);
+} catch(CoolsmsException $e) {
+    echo $e->getMessage(); // get error message
+    echo $e->getCode(); // get error code
+}