docs(changelog): add changelog

CHANGELOG.md

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+# MDPreview Changelog
+Все заметные изменения в этом проекте документируются в этом файле.
+
+Формат основан на [Keep a Changelog](https://keepachangelog.com/ru/1.0.0/),
+и проект использует [Semantic Versioning](https://semver.org/lang/ru/).
+
+
+## [0.4.0] - 2026-25-03
+### Added
+- Added button for copy edit command (`note edit current_note.md`)
+
+
+---
+
+
+## [0.3.0] - 2026-24-03
+### Added
+- Added flag `--random` for open browswer on random page (`--browser --random`)
+
+
+---
+
+
+## [0.2.1] - 2026-23-03
+### Fixed
+- Fix bug when listening port 0 (`--port 0`), browser open wrong port.
+
+
+---
+
+
+## [0.2.0] - 2026-23-03
+### Added
+- Added flag `--browser` for open page in browser automaticly
+
+
+---
+
+
+## [0.1.3] - 2026-23-03
+### Added
+- Added button "random file" to header
+
+
+### Fixed
+- Non-markdown files now correctly render
+
+
+## Changed
+- Translated from russian to eng
+
+
+---
+
+
+## [0.1.2] - 2026-22-03
+### Added
+- Added button "random file"
+- Added button "on main"
+
+
+## Changed
+- Default port now 8080
+
+
+---
+
+
+## [0.1.1] - 2026-21-03
+### Added
+- Added page title