Add CHANGELOG.md

Author: koppor

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).
+
+## [0.1.0] - 2019-09-25
+
+Initial public release
+
+[Unreleased]: https://github.com/dante-ev/latex-action/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/dante-ev/latex-action/releases/tag/v0.1.0