Add CHANGELOG.md for version 0.16.0 and 0.15.2 updates

Author: shoonia

CHANGELOG.md

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+# Changelog
+
+## [0.16.0] - 2026-05-13
+
+### Added
+- TypeScript definitions (`index.d.ts`) for better IDE support and type checking
+
+### Changed
+- Refactored options handling in `mini-css-class-name` for improved code clarity and maintainability
+- Updated `README` to include Vite usage documentation
+- Clarified `PostCSS` integration instructions in `README`
+
+## [0.15.2]
+
+### Changed
+- Refactored increment function to simplify parameters and improve readability
+- Updated Node.js version to 24 in CI configuration and `.nvmr`c
+
+### Fixed
+- Fixed increment function implementation with improved parameter handling
+