docs: 提供微信商户平台模块的示例项目

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5/Startup.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5
+{
+    using SKIT.FlurlHttpClient.Wechat.TenpayV3.Settings;
+
+    public class Startup
+    {
+        public IConfiguration Configuration { get; }
+
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddControllers();
+
+            // ע<><D7A2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+            services.AddOptions();
+            services.Configure<Options.WechatOptions>(Configuration.GetSection(nameof(Options.WechatOptions)));
+
+            // ע<>빤<EFBFBD><EBB9A4> HTTP <20>ͻ<EFBFBD><CDBB><EFBFBD>
+            services.AddHttpClient();
+            services.AddSingleton<CertificateManager, InMemoryCertificateManager>();
+            services.AddSingleton<Services.HttpClients.IWechatTenpayHttpClientFactory, Services.HttpClients.Implements.WechatTenpayHttpClientFactory>();
+        }
+
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            app.UseRouting();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllers();
+            });
+        }
+    }
+}