Adding links to the apispec (JSON) for OpenAPI.

See SCTCM-3488

apiconcepts/Tridion_Docs_15.1/overview.md

@@ -4,6 +4,8 @@ This section contains information for developers to develop applications on top
 
 You can only use the API classes and functions that are available from this page. Any other API functions are subject to change and not supported externally, so you should not use them.
 
+To directly access the API specification for Tridion Docs OpenAPI, go [here](../api/15.1/index.html)
+
 ## PowerShell modules
 
 ### [ISHDeploy](https://docs.rws.com/TridionDocs15.1/ISHDeploy/)

apiconcepts/Tridion_Docs_15/overview.md

@@ -0,0 +1,49 @@
+# Tridion Docs API Documentation #
+## [Content Manager Web Services API](https://docs.rws.com/TridionDocs15/WebServicesAPI) ##
+This section contains information for developers to develop applications on top of the Content Manager Web Services API.
+
+You can only use the API classes and functions that are available from this page. Any other API functions are subject to change and not supported externally, so you should not use them.
+
+To directly access the API specification for Tridion Docs OpenAPI, go [here](../api/15.0/index.html)
+
+## PowerShell modules
+
+### [ISHDeploy](https://docs.rws.com/TridionDocs15/ISHDeploy/)
+ISHDeploy is a PowerShell module that enables the code-as-configuration concept for Tridion Docs, starting from version 13.0.0, up to and including 15.0.0.
+
+### [ISHRemote](https://github.com/RWS/ISHRemote)
+ISHRemote is a PowerShell module on top of Tridion Docs Content Manager. Its goal is business automation on top of the Component Content Management System.
+
+### [ISHServer](https://github.com/RWS/ISHServer)
+ISHServer is a PowerShell module to help automate installation of prerequisites for Tridion Docs.
+
+### [ISHBootstrap](https://github.com/RWS/ISHBootstrap)
+ISHBootstrap is a bootstrapper for deployments of Tridion Docs Content Manager.
+
+## Tridion DXA ##
+This section is intended for developers wanting to extend DXA functionality using its open-source .NET and Java APIs.
+
+### Customizing and extending DXA ###
+[Development prerequisites](https://docs.rws.com/784837/720093/sdl-digital-experience-accelerator-2-2/development-prerequisites)
+Developing custom Tridion Sites web applications/sites requires a full development environment. The necessary third-party software differs depending on whether you are developing a .NET or Java application.
+
+[.NET web application development](https://docs.rws.com/784837/682805/sdl-digital-experience-accelerator-2-2/-net-web-application-development)
+Set up a .NET development environment to customize or extend the DXA .NET web application.
+
+[Java web application development](https://docs.rws.com/784837/720545/sdl-digital-experience-accelerator-2-2/java-web-application-development)
+Set up a Java development environment to customize or extend the DXA Java web application.
+
+[Using RWS's public APIs](https://docs.rws.com/784837/679912/sdl-digital-experience-accelerator-2-2/using-sdl-s-public-apis)
+Use the available public APIs to extend and customize the behavior of DXA.
+
+[Creating the folder structure for a custom module](https://docs.rws.com/784837/651695/sdl-digital-experience-accelerator-2-2/creating-the-folder-structure-for-a-custom-module)
+A custom module implements a distinct piece of functionality that is only relevant to some implementations. When you want to add a module to DXA, you need to create a folder structure in Content Manager.
+
+[Model mapping and semantics](https://docs.rws.com/784837/695734/sdl-digital-experience-accelerator-2-2/model-mapping-and-semantics)
+Domain (Content Manager) Models are mapped to the Presentation (View) Models using Model Semantics so that web developers can work with data structures optimized for the Views they are creating without having to have a deep understanding of the underlying content model.
+
+### API reference documentation downloads ###
+Links to download the API reference documentation for DXA.
+- [DXA API for .NET](https://docs.sdl.com/DXA/DotNET/2.2/APIDOC/)
+- [DXA API for Java](https://docs.sdl.com/DXA/Java/2.2/APIDOC/)
+- [Content Delivery's Public Content API](https://docs.rws.com/TridionDocs15/PublicContentAPIReference)