docs: created changelog.

Author: luisaveiro

CHANGELOG.md

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+# Changelog
+All notable changes to `luisaveiro/docker-reverse-proxy` 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]
+
+## [v0.1.0] - 2021-12-01
+### Added
+- Docker Compose YAML file.
+- Caddyfile example file.
+- DotEnv example file.