docs: 完善微信商户平台模块的示例项目

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5/Models/CreateOrderByJsapiRequest.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Models
+{
+    public class CreateOrderByJsapiRequest
+    {
+        public string MerchantId { get; set; } = default!;
+
+        public string AppId { get; set; } = default!;
+
+        public string OpenId { get; set; } = default!;
+
+        // NOTICE: 单机演示时金额来源于客户端请求，生产项目请替换成服务端计算生成
+        public int Amount { get; set; }
+    }
+}