Merge pull request #12926 from abpframework/EngincanV-patch-1

Add app-nolayers template docs to Startup Templates docs

docs/en/Startup-Templates/Index.md

@@ -3,6 +3,7 @@
 While you can start with an empty project and add needed packages manually, startup templates make easy and comfortable to start a new solution with the ABP framework. Click the name from the list below to see the documentation of the related startup template:
 
 * [**app**](Application.md): Application template.
+* [**app-nolayers**](Application-Single-Layer.md): Application (single layer) template.
 * [**module**](Module.md): Module/service template.
 * [**console**](Console.md): Console template.
 * [**WPF**](WPF.md): WPF template.