Documentation - Add initial changelog

The changelog syntax is based on keepachangelog.com.

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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## 1.0.0 - 2018-03-31
+
+### Added
+
+* Syntax highlighting
+* Test suites folding
+
+[Unreleased]: https://github.com/numaru/vscode-tap/compare/v1.0.0...develop