Added CHANGELOG.md (keepachangelog.com format)

CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog][1].
+
+This project tries to adhere to [Semantic Versioning][2].
+
+## [Unreleased]
+
+## [1.1.1] - 2023-07-01
+
+### Added
+
+Ignore QtCreator files (redtide)
+Added .editorconfig and .clang-format (redtide)
+
+### Changed
+
+Install icon to the app_id location (somini)
+Move the output name overlay to the bottom left (WhyNotHugo)
+Bump to current development version, use semver (redtide)
+Updated desktop file (redtide)
+
+### Fixed
+
+Fixed license SPDX ID in main meson.build
+
+## [1.1] - 2023-04-18
+
+### Added
+
+Added categories to the program shortcut (IntinteDAO)
+
+### Changed
+
+Add package links (Jason Francis)
+Backport GTK4 changes (Jason Francis)
+Create WdHeadForm class (Jason Francis)
+Update README (Jason Francis)
+Use correct versions when binding globals (Simon Ser)
+
+## [v1.0] - 2020-05-09
+
+First release after <https://github.com/MichaelAquilina/wdisplays> fork
+(backup of the original, deleted repository at <https://github.com/cyclopsian/wdisplays>)
+
+### Changed
+
+Update application ID and readme (Jason Francis)
+
+
+[1]: https://keepachangelog.com/en/1.0.0/
+[2]: https://semver.org/spec/v2.0.0.html
+
+[Unreleased]: https://github.com/artizirk/wdisplays/compare/1.1.1...HEAD
+[1.1.1]:  https://github.com/artizirk/wdisplays/compare/1.1...1.1.1
+[1.1]: https://github.com/artizirk/wdisplays/compare/1.0...1.1
+[1.0]: https://github.com/artizirk/wdisplays/releases/tag/1.0