update readme

README.md

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+### 安装
+```shell
+composer require maiyoule/mqttclient_author
+```
+
+### 配置
+```php
+$manager = new MQTTManager();
+//设置APPID
+$manager->setAppId('');
+//设置私钥
+$manager->setPrivateKey('');
+```
+
+### 使用
+
+```php
+//创建MQTT用户
+$request = new AppUserCreateRequest();
+$request->setPassword('');
+//备注信息
+$request->setFettle('');
+//角色 user or admin
+$request->setRole('user');
+//业务列表
+$request->setBiz(['ch','ws']);
+
+$biz = $manager->exec($request);
+if (!$biz->isSuccess()) {
+    fail($biz->getMessage());
+}
+$data = $biz->getData();
+//....
+print_r($data);
+```