Update changelog for 3.0

Author: desplesda

CHANGELOG.md

@@ -4,11 +4,18 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-
 ## [Unreleased]
 
 ### Added
 
+### Changed
+
+### Removed
+
+## [3.0.0] 2025-05-16
+
+### Added
+
 - A basic saliency sample to show off the basics and how to get started with storylets.
 - Logo and docs/help links to custom editors in Yarn Project (standalone), Yarn Script (standalone), and Dialogue Runner (component when on GameObject).
 - Description of package samples which summarises Samples therein.