Add CHANGELOG.md and update ReleaseNotes.md

- Included CHANGELOG.md in the documentation files for better tracking of changes.
- Updated ReleaseNotes.md to reflect the latest changes and improvements, including:
  - New features and enhancements in documentation for various DDS components.
  - Key documentation updates for user experience and understanding.
  - Complete changelog reference for all changes made in the current and previous versions.

Author: AnarManafov