Create CHANGELOG.md

Author: clipperhouse

CHANGELOG.md

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+# Changelog
+
+## [0.5.0]
+
+[Compare](https://github.com/clipperhouse/displaywidth/compare/v0.4.1...v0.5.0)
+
+### Added
+- Unicode 16 support
+- Improved emoji presentation handling per Unicode TR51
+
+### Changed
+- Corrected VS15 (U+FE0E) handling: now preserves base character width (no-op) per Unicode TR51
+- Performance optimizations: reduced property lookups
+
+### Fixed
+- VS15 variation selector now correctly preserves base character width instead of forcing width 1
+
+## [0.4.1]
+
+[Compare](https://github.com/clipperhouse/displaywidth/compare/v0.4.0...v0.4.1)
+
+### Changed
+- Updated uax29 dependency
+- Improved flag handling
+
+## [0.4.0]
+
+[Compare](https://github.com/clipperhouse/displaywidth/compare/v0.3.1...v0.4.0)
+
+### Added
+- Support for variation selectors (VS15, VS16) and regional indicator pairs (flags)
+
+## [0.3.1]
+
+[Compare](https://github.com/clipperhouse/displaywidth/compare/v0.3.0...v0.3.1)
+
+### Added
+- Fuzz testing support
+
+### Changed
+- Updated stringish dependency
+
+## [0.3.0]
+
+[Compare](https://github.com/clipperhouse/displaywidth/compare/v0.2.0...v0.3.0)
+
+### Changed
+- Dropped compatibility with go-runewidth
+- Trie implementation cleanup