docs: 完善微信商户平台模块的示例项目

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5/Options/WxpayOptions.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Options;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Options
+{
+    public partial class WxpayOptions : IOptions<WxpayOptions>
+    {
+        WxpayOptions IOptions<WxpayOptions>.Value => this;
+
+        public WechatMerchant[] Merchants { get; set; } = Array.Empty<WechatMerchant>();
+
+        public string CallbackEntry { get; set; } = string.Empty;
+    }
+
+    partial class WxpayOptions
+    {
+        public class WechatMerchant
+        { 
+            public string MerchantId { get; set; } = string.Empty;
+
+            public string SecretV3 { get; set; } = string.Empty;
+
+            public string CertSerialNumber { get; set; } = string.Empty;
+
+            public string CertPrivateKey { get; set; } = string.Empty;
+        }
+    }
+}