Add project files.

Correo.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.4.33205.214
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Correo", "Correo\Correo.csproj", "{B712E585-E63F-4A6D-8E17-FEFACE04BBE2}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B712E585-E63F-4A6D-8E17-FEFACE04BBE2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B712E585-E63F-4A6D-8E17-FEFACE04BBE2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B712E585-E63F-4A6D-8E17-FEFACE04BBE2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B712E585-E63F-4A6D-8E17-FEFACE04BBE2}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {86FCF989-26FC-41E9-8A23-9485606D619D}
+	EndGlobalSection
+EndGlobal

Correo/Controllers/SystemController.cs

@@ -0,0 +1,22 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace Correo.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class SystemController : ControllerBase
+    {
+        private readonly ILogger<SystemController> _logger;
+
+        public SystemController(ILogger<SystemController> logger)
+        {
+            _logger = logger;
+        }
+
+        [HttpGet("ping")]
+        public string Get()
+        {
+            return $"Ping success. System datetime: {DateTime.Now}";
+        }
+    }
+}

Correo/Correo.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.2.3" />
+  </ItemGroup>
+
+</Project>

Correo/Program.cs

@@ -0,0 +1,34 @@
+namespace Correo
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            var builder = WebApplication.CreateBuilder(args);
+
+            // Add services to the container.
+
+            builder.Services.AddControllers();
+            
+            // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+            builder.Services.AddEndpointsApiExplorer();
+            builder.Services.AddSwaggerGen();
+
+            var app = builder.Build();
+
+            // Configure the HTTP request pipeline.
+            if (app.Environment.IsDevelopment())
+            {
+                app.UseSwagger();
+                app.UseSwaggerUI();
+            }
+
+            app.UseAuthorization();
+
+
+            app.MapControllers();
+
+            app.Run();
+        }
+    }
+}

Correo/Properties/launchSettings.json

@@ -0,0 +1,14 @@
+{
+  "profiles": {
+    "Correo": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "http://localhost:5061",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

Correo/appsettings.Development.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

Correo/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}