feat(pluggable-widgets-mcp): add changelog

Author: rahmanunver

packages/pluggable-widgets-mcp/CHANGELOG.md

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+# Changelog
+
+All notable changes to this MCP server 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
+
+- We introduce pluggable-widgets-mcp.