pay doc

docs/WXPay.md

-# 敬请期待。。。
+# 微信支付
\ No newline at end of file
+## Android
+
+```dart
+Fluwx fluwx = new Fluwx();
+fluwx.pay(WeChatPayModel(
+                  appId: 'wxd930ea5d5a258f4f', 
+                  partnerId: '1900000109',
+                  prepayId: '1101000000140415649af9fc314aa427',
+                  packageValue: 'Sign=WXPay',
+                  nonceStr: '1101000000140429eb40476f8896f4c9',
+                  timeStamp: '1398746574',
+                  sign: '7FFECB600D7157C5AA49810D2D8F28BC2811827B',
+                  signType: '选填',
+                  extData: '选填'
+                ));
+```
+  
\ No newline at end of file

example/android/app/src/main/AndroidManifest.xml

@@ -36,5 +36,6 @@
             </intent-filter>
         </activity>
         <activity android:name=".wxapi.WXEntryActivity" />
+        <activity android:name=".wxapi.WXPayEntryActivity" />
     </application>
 </manifest>

example/android/app/src/main/kotlin/com/jarvan/fluwxexample/wxapi/WXPayEntryActivity.java

+package com.jarvan.fluwxexample.wxapi;
+
+import android.app.Activity;
+
+import com.jarvan.fluwx.handler.FluwxResponseHandler;
+import com.tencent.mm.opensdk.modelbase.BaseReq;
+import com.tencent.mm.opensdk.modelbase.BaseResp;
+import com.tencent.mm.opensdk.openapi.IWXAPIEventHandler;
+
+public class WXPayEntryActivity extends Activity implements IWXAPIEventHandler {
+
+    @Override
+    public void onReq(BaseReq baseReq) {
+
+    }
+
+    @Override
+    public void onResp(BaseResp baseResp) {
+        FluwxResponseHandler.INSTANCE.handleResponse(baseResp);
+    }
+}

lib/src/models/wechat_pay_model.dart

+import 'package:flutter/foundation.dart';
+
 class WeChatPayModel{
   final appId;
   final partnerId;
@@ -10,8 +12,9 @@ class WeChatPayModel{
   final extData;
 
 
-  WeChatPayModel(this.appId, this.partnerId, this.prepayId, this.packageValue,
-      this.nonceStr, this.timeStamp, this.sign,{this.signType, this.extData});
+  WeChatPayModel({@required this.appId,@required this.partnerId,@required this.prepayId,
+    @required this.packageValue,@required this.nonceStr,@required this.timeStamp,@required this.sign,
+    this.signType, this.extData});
 
   Map toMap() {
     return {