docs: [skip ci] ios setup 작성

Author: ko-devHong

README.md

@@ -12,19 +12,19 @@ This library uses the following native MQTT client libraries:
 
 To use this library, you must first install it using npm or yarn.
 
+```sh
+npm install @ko-developerhong/react-native-mqtt
+# OR
+yarn add @ko-developerhong/react-native-mqtt
+```
+
 ## IOS Setup
 Add Podfile
 ```
 pod "CocoaMQTT", :modular_headers => true
 pod "MqttCocoaAsyncSocket", :modular_headers => true
 ```
 
-```sh
-npm install @ko-developerhong/react-native-mqtt
-# OR
-yarn add @ko-developerhong/react-native-mqtt
-```
-
 ## Import
 ```ts
 import MqttClient, { ConnectionOptions, ClientEvent, MQTTEventHandler } from 'react-native-mqtt';