doc: add CHANGELOG.md

Author: StrangeRanger

hardening/Root Locker/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).
+
+## v1.0.6 - 2024-04-13
+
+### Changed
+
+- Improved documentation of code.
+
+## v1.0.5 - 2022-07-13
+
+### Changed
+
+- Changed how the variables used to change the color of output text, are formatted, in the hopes of increasing portability.
+- Exit codes beyond 1, were reverted back to 1.
+
+## v1.0.4 - 2022-07-10
+
+### Changed
+
+- Modified exit codes.
+- No longer backs up `/etc/shadow`.
+
+## v1.0.3 - 2020-12-01
+
+### Changed
+
+- Changed commenting style.
+
+### Fixed
+
+- Added missing variable to `echo`, resulting in the text color to remain cyan.
+
+## v1.0.2 - N/A
+
+### Changed
+
+- Changed placement of `read -p "We will now disable the root account. Press [Enter] to continue."`.
+
+## v1.0.0 - N/A
+
+- Initial creation.