adding Introduction content

doc/source/internal/helpcenter_training/introduction.rst

@@ -1,3 +1,42 @@
 ============
 Introduction
-============
+============
+
+The HelpCenter3.0 is Open Telekom Cloud product developed by Ecosystem squad introducing new approach in the documentation management.
+It aims to bring the benefits of the gitops approach such as:
+
+-  Openness
+-  Transparency
+-  Comprehensive review capabilities
+-  Full control during the documentation lifecycle
+-  Documentation as a source code
+
+.. figure:: /_static/images/helpcenter_gitops.png
+
+Solution is completely open source based and HLD is described at https://docs.otc-service.com/system-config/docsportal.html
+Implementation is based on:
+
+-  Restructured Text (RST) as source documentation format
+-  Gitea/Github as a repository
+-  Zuul as a CI/CD engine for workflows
+-  Sphinx as a documentation rendering framework (HTML/PDF/...
+-  OpenSearch as a search engine
+-  Swift object storage as a storage for documentation
+-  Pandoc as a documentation converter
+-  OTC Infrastructure (ECS, CCE, ELB, ...)
+
+HC3.0 comes with following features:
+
+-  Support of UMN, API, DEV and other public facing documents
+-  PROD and PREPROD documentation portal:
+   -  docs.otc.t-systems.com
+   -  docs-int.otc.service.com
+-  Support of all old HC links redirections
+-  Search functionality
+-  Mobile-ready UI layout
+-  Report issue functionality directly on any page
+-  Suggest documentation fix functionality 
+-  Consolidation of extra content like blueprints, tools, and libraries for developers 
+-  One repository represents one cloud service
+-  Each squad can control and manage their documentation independently
+-  Automatization and check jobs across whole documentation lifecycle (from import to release)