docs: 提供微信公众平台模块的示例项目

samples/SKIT.FlurlHttpClient.Wechat.Api.Sample_Net5/Options/WechatOptions.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.Api.Sample_Net5.Options
+{
+    public partial class WechatOptions : IOptions<WechatOptions>
+    {
+        WechatOptions IOptions<WechatOptions>.Value => this;
+
+        public WechatAccount[] Accounts { get; set; } = Array.Empty<WechatAccount>();
+
+        public string CallbackState { get; set; } = string.Empty;
+
+        public string CallbackToken { get; set; } = string.Empty;
+    }
+
+    partial class WechatOptions
+    {
+        public class WechatAccount
+        { 
+            public string? GhId { get; set; }
+
+            public string AppId { get; set; } = string.Empty;
+
+            public string AppSecret { get; set; } = string.Empty;
+        }
+    }
+}