docs(CHANGELOG): add changelog document

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]
+
+### Added
+- Task sorting & filtering
+- Redesigned the Task Details UI
+
+### Fixed
+- removed CORS middleware to fix security issue
+- Added 3 retries with backoff to initial database connection [(#47)](https://github.com/JordanKnott/taskcafe/issues/47)
+- Can now actually set a due date
+
+## [0.1.1] - 2020-08-21
+
+### Fixed
+- fix panic(nil) when loading config if config file actually exists
+
+## [0.1.0] - 2020-08-21
+
+### Added
+- first "stable" alpha release