[skip ci] Add changelog in repo

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).
+
+All releases can be found on https://code.vikunja.io/frontend/releases.
+
+The releases aim at the api versions which is why there are missing versions.
+
+## [0.7] - 2019-04-30
+
+### Added
+
+* Design overhaul (#28)
+* Gantt charts (#29)
+* Pretty Scrollbars
+* Task colors
+
+### Fixed
+
+* Fixed getting tasks (#27)
+
+## [0.6] - 2019-03-08
+
+### Added
+
+* Labels (#25)
+* Task priorites (#19)
+* Task assingees (#21)
+
+### Changed
+
+* All requests are now using models and services, improving the development experience
+* Team managing (#18)
+
+## [0.5] - 2018-12-29
+
+### Added
+
+* User email verification when registering
+* password reset
+* Task overview
+* Multiple reminders
+* Repeating tasks
+* Subtasks
+* Task duration
+* All new design
+* Week and month view for tasks
+
+### Changed
+
+* Go to overview when clicking on the logo
+* CSS improvements
+* Don't show options to edit pseudonamespace
+* Delay loading animation to not show it when the request finishes in < 100ms
+* Use email instead of username when resetting a password
+
+### Fixed
+* Fixed trying to verify an email when there was none
+* Fixed loading tasks when the user was not authenticated
+
+## [0.1] - 2018-09-20
+