6802 - Create landing pages for OL API/SPIs

Create landing pages for OL API/SPIs

 #6802

modules/reference/pages/api/open-liberty-apis.adoc

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+:page-layout: general-reference
+:page-type: general
+:page-description: Open Liberty provides a set of APIs that you can use to build, deploy, and manage Java applications. These APIs include features for handling HTTP requests, managing security, implementing RESTful services, and interacting with databases.
+:page-categories: Open Liberty APIs
+:seo-title: Open Liberty APIs documentation
+:seo-description: Open Liberty provides a set of APIs that you can use to build, deploy, and manage Java applications. These APIs include features for handling HTTP requests, managing security, implementing RESTful services, and interacting with databases.
+
+= Open Liberty APIs
+
+Open Liberty provides additional application programming interfaces (APIs) which extend and complement the Jakarta and MicroProfile APIs. These APIs enable various Liberty capabilities that go beyond the Jakarta and MicrProfile specifications, with a strong focus on security.
+
+With Liberty's xref:ROOT:zero-migration-architecture.adoc[Zero Migration] policy, you can rest assured that future releases will continue to provide these APIs.

modules/reference/pages/api/open-liberty-spis.adoc

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+:page-layout: general-reference
+:page-type: general
+:page-description: Open Liberty SPIs, or Service Provider Interfaces help you to extend and customize the behavior of the Open Liberty application server.
+:page-categories: Open Liberty SPIs
+:seo-title: Open Liberty SPIs documentation
+:seo-description: Open Liberty SPIs, or Service Provider Interfaces help you to extend and customize the behavior of the Open Liberty application server.
+
+= Open Liberty SPIs
+
+Open Liberty Service Provider Interfaces (SPIs) enable the extension and customization of various runtime capabilities. Using user features, these SPIs promote flexibility and maintainability by enabling developers to add new functions, incorporate extensions, or connect Open Liberty with other systems without altering the core software.
+
+With Liberty's xref:ROOT:zero-migration-architecture.adoc[Zero Migration] policy, you can rest assured that future releases will continue to provide these SPIs.