docs: 提供微信公众平台模块的示例项目

samples/SKIT.FlurlHttpClient.Wechat.Api.Sample_Net5/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Hosting;
+
+namespace SKIT.FlurlHttpClient.Wechat.Api.Sample_Net5
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
+
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(builder =>
+                {
+                    builder.UseStartup<Startup>();
+                })
+                .Build()
+                .Run();
+        }
+    }
+}