Add CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+All notable changes to Yorkie JS SDK will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and Yorkie JS SDK adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.1.0] - 2020-11-07
+
+First public release
+
+### Added
+ - Add `Client` and `Document`
+ - Add Custom CRDT data type `Text` for code editor
+ - Add Custom CRDT data type `RichText` for WYSIWYG editor
+ - Add examples: CodeMirror, Drawing, Quill
+ - Support Network Auto Recovery
+ - Add Peer Awareness
+ - Add Custom CRDT data type `Counter`
+
+### Changed
+
+### Removed
+
+### Deprecated
+
+[Unreleased]: https://github.com/yorkie-team/yorkie-js-sdk/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/yorkie-team/yorkie-js-sdk/releases/tag/v0.1.0# 
+