add wegame demo

+let sdk = require('./wxsdk/commonH5SDK.js')
+
+
+export default class Demo{
+  constructor(){
+    this.openId = ""
+  }
+
+
+  init(){
+    var sdkInfo = {
+      "gameSimpleName": "ylyhW1",//游戏简称
+      "sdkSimpleName": "youdian_qq",//sdk简称
+      "sdkVersionCode": "V1_0",//sdk服务端版本号
+      "sdkClientVersion": "1.0.1"//sdk客户端版本号
+    }
+    var that = this;
+    sdk.init(sdkInfo, function (code, msg) {
+      console.log("test init success:" + code + "msg:" + msg)
+      switch (code) {
+        case sdk.code.INIT_SUCCESS://初始化成功回调（其他状态可在youaiH5SDK.js的code中查看）
+          sdk.login("test")
+          break;
+        case sdk.code.LOGIN_SUCCESS://登录成功回调
+          console.log("login success")
+          console.log(msg)
+          that.openId = msg.openId
+          break;
+      }
+    })
+  }
+
+  createRole(){
+    //type, data
+    var data = {
+      "roleId": "15",
+      "roleName": "test",
+      "roleLevel": "15",
+      "roleSex": "test",
+      "serverId": "15",
+      "serverName": "test",
+      "roleCTime": "15",
+      "partyName": "test",
+      "roleType": "test",
+      "roleChangeTime": "test",
+      "vipLevel": "15",
+      "diamond": "15",
+      "moneyType": "test",
+      "custom": "test"
+    }
+
+    //type为youaiH5SDK.js中的type中的类型：创建角色，进入游戏，角色更新
+    sdk.submitData(sdk.type.createRole, data)
+  }
+
+  pay() {
+    var payInfo = {
+      "serverId": "1233",
+      "serverName": "服务器名字",
+      "playerId": "3331",
+      "openId": this.openId,
+      "playerName": "角色名字",
+      "playerLevel": "角色等级",
+      "postAmount": "1",
+      "productId": "12443",
+      "productName": "商品名称",
+      "productDesc": "商品描述",
+      "custom": "自定义透传参数",
+      "exchange": "10",
+      "otherInfo": "额外信息",
+      "timestamp": "1244345435435"
+    };
+    //以上信息中，游戏如没有传空值即可
+    //启用支付接口
+    sdk.pay(payInfo);
+  }
+
+  //扩展接口
+  expansionInterface(){
+    /**
+     * 
+     * @param {*} result 
+     */
+    var expansionCallBack = function(result){ 
+    }
+    youaiH5SDK.expansionInterface(youaiH5SDK.expansion_type.share,"",expansionCallBack);
+  }
+}
\ No newline at end of file