create aspnet api with postgresql

This version added a compose application using:
* ASP.Net API Core
* EntityFramework Core
* Postgresql

Signed-off-by: Eduardo Silva <eduardo.lour.silva@gmail.com>

aspnet-api-postgresql/api/Controllers/HealthCheckController.cs

@@ -0,0 +1,36 @@
+using aspnet_api_postgresql.Infrastructure.Database;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace aspnet_api_postgresql.Controllers;
+
+[ApiController]
+[Route("[controller]")]
+public class HealthCheckController : ControllerBase
+{
+    private readonly ILogger<HealthCheckController> _logger;
+    private readonly ApplicationDbContext _dbContext;
+
+    public HealthCheckController(ApplicationDbContext dbContext, ILogger<HealthCheckController> logger)
+    {
+        _logger = logger;
+        _dbContext = dbContext;
+    }
+
+    [HttpGet]
+    public string Ping()
+    {
+        try
+        {
+            _dbContext.Database.OpenConnection();
+            _dbContext.Database.ExecuteSqlRaw("SELECT 1");
+            _dbContext.Database.CloseConnection();
+            return "OK";
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error connecting to database");
+            return "Error connecting to database";
+        }
+    }
+}