adding changelog

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to **Pipecat** will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+- Added new foundational examples for `LiveKitTransportLayer` -
+
+  - `29-livekit-audio-chat.py` - Supports both Audio to Audio and Text to Audio
+    chat pipelines.
+
 ## [0.0.52] - 2024-12-24
 
 ### Added