Add a changelog

Author: asciipip

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [2.0.0]
+
+I wasn't doing versioned releases until 2.0.0, but a summary of changes
+between the original 1.0.0 release and 2.0 includes:
+
+### Added
+
+ - Show recurrence rules in an event
+ - Added display of URL and Comment iCalendar fields
+ - Set up packaging with Poetry
+ - Released on PyPI
+
+## [1.0.0]
+
+There wasn't a specific release, but eventually `viewical` was functional
+enough for everyday use.
+
+  [2.0.0]: https://github.com/asciipip/mutt-ical/compare/1.0.0..2.0.0
+  [1.0.0]: https://github.com/asciipip/mutt-ical/releases/tag/1.0.0