Add CHANGELOG to document changes to project

CHANGELOG.md

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+# Changelog
+All notable changes to crunchy-hugo-theme 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).
+
+## [Develop]
+
+### Added
+
+### Changed
+
+### Removed
+
+### Fixed
+
+## [2.2.0] - 2019-02-23
+
+### Removed
+
+- Removed references to a Highlight JavaScript file which was not in use.
+
+### Fixed
+
+- The chevron FontAwesome icons on the side navigation menu for the crunchy-containers and postgres-operator projects were originally "not found" on page load of specifically parent pages with children, and the icons would not show as expected. They now load as expected.
+
+- A jQuery scroll fix was added; when clicking on an anchor, the header for that section no longer hides behind the top sticky navigation menu.