Add .NET 8.0 web app with minimal API and background worker

Introduced a new .NET 8.0 web application project with a minimal API setup.
Configured Swagger for API documentation and added a `Worker` class as a
background service for periodic tasks.

Added `launchSettings.json` to define development profiles for HTTP, HTTPS,
and IIS Express. Configured logging levels in `appsettings.json` and
`appsettings.Development.json`.

Included `Swashbuckle.AspNetCore` package for Swagger integration and
configured the HTTP request pipeline to support development and production
environments.

ECMJobRunner.WebCron/Worker.cs

@@ -0,0 +1,24 @@
+namespace ECMJobRunner.WebCron
+{
+    public class Worker : BackgroundService
+    {
+        private readonly ILogger<Worker> _logger;
+
+        public Worker(ILogger<Worker> logger)
+        {
+            _logger = logger;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                if (_logger.IsEnabled(LogLevel.Information))
+                {
+                    _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
+                }
+                await Task.Delay(1000, stoppingToken);
+            }
+        }
+    }
+}