reference the sample text templating source code

docs/en/Samples/Index.md

@@ -42,6 +42,9 @@ While there is no Razor Pages & MongoDB combination, you can check both document
   * [Source code](https://github.com/abpframework/abp-samples/tree/master/RabbitMqEventBus)
   * [Distributed event bus document](../Distributed-Event-Bus.md)
   * [RabbitMQ distributed event bus integration document](../Distributed-Event-Bus-RabbitMQ-Integration.md)
+* **Text Templates Demo**: Shows different use cases of the text templating system.
+  * [Source code](https://github.com/abpframework/abp-samples/tree/master/TextTemplateDemo)
+  * [Text templating documentation](../Text-Templating.md)
 * **Authentication Customization**: A solution to show how to customize the authentication for ASP.NET Core MVC / Razor Pages applications.
   * [Source code](https://github.com/abpframework/abp-samples/tree/master/aspnet-core/Authentication-Customization)
   * Related "[How To](../How-To/Index.md)" documents:

docs/en/Text-Templating.md

@@ -42,6 +42,10 @@ Template rendering engine is very powerful;
 * You can define **layout templates** to be used as the layout while rendering other templates.
 * You can pass arbitrary objects to the template context (beside the model) for advanced scenarios.
 
+### Source Code
+
+Get [the source code of the sample application](https://github.com/abpframework/abp-samples/tree/master/TextTemplateDemo) developed and referred through this document.
+
 ## Installation
 
 It is suggested to use the [ABP CLI](CLI.md) to install this package.
@@ -442,4 +446,10 @@ Return `null` if your source can not find the content, so `ITemplateContentProvi
 
 ### Template Definition Manager
 
-`ITemplateDefinitionManager` service can be used to get the template definitions (created by the template definition providers).
+`ITemplateDefinitionManager` service can be used to get the template definitions (created by the template definition providers).
+
+## See Also
+
+* [The source code of the sample application](https://github.com/abpframework/abp-samples/tree/master/TextTemplateDemo) developed and referred through this document.
+* [Localization system](Localization.md).
+* [Virtual File System](Virtual-File-System.md).