CDT 11.3 N&N starting point

Part of #420

NewAndNoteworthy/CDT-11.3.md

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+# Release Notes and New & Noteworthy page
+
+This is the New & Noteworthy page for CDT 11.3 which is part of Eclipse 2023-09 Simultaneous Release
+
+---
+
+# Release Notes
+
+
+# API Changes, current and planned
+
+Please see [CHANGELOG-API](CHANGELOG-API.md) for details on the breaking API changes in this release as well as future planned API changes.
+
+# Noteworthy Issues and Pull Requests
+
+See [Noteworthy issues and PRs](https://github.com/eclipse-cdt/cdt/issues?q=is%3Aclosed+label%3Anoteworthy+milestone%3A11.3.0) for this release in the issue/PR tracker.
+
+# Bugs Fixed in this Release
+
+See [GitHub milestones](https://github.com/eclipse-cdt/cdt/milestone/7?closed=1)

NewAndNoteworthy/README.md

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 What's new and noteworthy in:
 
+- [CDT 11.3/2023-09](CDT-11.3.md)
 - [CDT 11.2/2023-06](CDT-11.2.md)
 - [CDT 11.1/2023-03](CDT-11.1.md)
 - [CDT 11.0/2022-12](CDT-11.0.md)