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/appsettings.json

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