docs: add CHANGELOG

Author: Nexus

CHANGELOG.md

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+# Changelog
+
+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/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.8.0] - 2026-03-01
+
+### Added
+- GitHub Actions CI workflow
+- More code examples (JWT, file-upload, CORS)
+- ExistsRouter method to Router interface
+
+### Changed
+- Upgrade Go version to 1.21
+- Upgrade dependencies
+- Improve README with badges and quick start guide
+
+### Fixed
+- Issue #245: Return 404 instead of 301 for trailing slash in parameterized routes
+- Issue #250: Support AutoOPTIONS for route groups
+
+### Removed
+- Deprecated Travis CI configuration
+
+## [1.7.21] - 2023-04-15
+
+### Added
+- SessionManager.RemoveSessionState
+- HttpContext.DestroySession()
+
+## [1.7.20] - 2022-08-11
+
+### Fixed
+- Delete minor unreachable code
+
+## [1.7.19] - 2021-04-20
+
+### Added
+- SetReadTimeout, SetReadHeaderTimeout, SetIdleTimeout, SetWriteTimeout in HttpServer
+
+### Fixed
+- deepcopy middleware issue
+
+## [1.7.18] - 2021-04-20
+
+### Fixed
+- GetRandString returning same result