Add CoolSMS PHP SDK, and update Composer dependencies

vendor/coolsms/php-sdk/examples/senderid/example_set_default.php

@@ -0,0 +1,34 @@
+<?php
+/**
+ * #example_set_default
+ *
+ * This sample code demonstrate how to set default sender number through CoolSMS Rest API PHP
+ * for more info, visit
+ * www.coolsms.co.kr
+ */
+
+use Nurigo\Api\SenderID;
+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
+    $rest = new SenderID($api_key, $api_secret);
+
+    // handle_key are mandatory. must be filled
+    $handle_key = 'C29CE02IOE9'; // sender number handle key. check for 'example_list'
+
+    // Optional parameters for your own needs
+    // $site_user = 'admin'; // site user_id. '__private__' is default value
+
+    $result = $rest->setDefault($handle_key); // or $rest->setDefault($handle_key, $site_user);
+    print_r($result);
+} catch(CoolsmsException $e) {
+    echo $e->getMessage(); // get error message
+    echo $e->getCode(); // get error code
+}