Add changelog

Author: rogden

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).
+
+## [1.1.0] - 2020-07-27
+
+### Added
+
+- `export` command to export the viewer for static hosting
+- `serve` command to serve the viewer. This is the default command and equivalent to running `tailwind-config-viewer` without specifying a command.
+
+## [1.0.0] - 2020-07-21
+
+- Initial Release