Add built-in features documentation for Single Layer Web Application template

docs/en/solution-templates/single-layer-web-application/built-in-features.md

@@ -0,0 +1,25 @@
+# Single Layer Solution: Built-In Features
+
+```json
+//[doc-nav]
+{
+  "Previous": {
+    "Name": "Db Migrator",
+    "Path": "solution-templates/single-layer-web-application/db-migrator"
+  },
+  "Next": {
+    "Name": "Authentication",
+    "Path": "solution-templates/single-layer-web-application/authentication"
+  }
+}
+```
+
+The Single Layer solution template includes several built-in features to help you get started with your single-layer web application. These features are designed to provide a solid foundation for your application and help you focus on your business logic. This document provides an overview of the built-in features included in the Single Layer solution template. The following documents explain these features in detail:
+
+* [Authentication](authentication.md)
+* [Database configurations](database-configurations.md)
+* [Logging (with Serilog)](logging.md)
+* [Swagger integration](swagger-integration.md)
+* [Multi-Tenancy](multi-tenancy.md)
+* [BLOB storing](blob-storing.md)
+* [CORS configuration](cors-configuration.md)