update README

Author: xutl

README.md

@@ -41,7 +41,8 @@ return [
 
 使用
 ----
-
+ 
+ v1.0
 ```php
 use xutl\qcloud\Qcloud;
 
@@ -55,6 +56,35 @@ $package = [
 print_r($wenzhi->TextKeywords($package));
 ```
 
+v2.0 使用方法
+```php
+use xutl\qcloud\Qcloud;
+
+/** var Qcloud $qcloud */
+$qcloud = Yii::$app->qcloud;
+/** @var \yii\httpclient\Response $response */
+$response = $qcloud->createRequest(QCloud::API_CNS)->setData(['Action'=>'DomainList',])->send();;
+print_r($response->data);
+```
+
+v2.0 使用方法 2 ,适用于没有内置的接口，通过此方法来请求。
+```php
+use xutl\qcloud\Client;
+
+/** var Client $client */
+$request = (new Client([
+                      'serverHost' => 'cns.api.qcloud.com',
+                      'secretId' => '123456',
+                      'secretKey' => '654321',
+                      'region' => null
+                  ]))
+                  ->createRequest();
+                  
+/** @var \yii\httpclient\Response $response */
+$response = $request->setMethod('POST')->setData(['Action'=>'DomainList',])->send();;
+print_r($response->data);
+```
+
 资源
 -----