Add CHANGELOG

Author: gpahal

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]
+
+### Added
+- Full compatibility with Dgraph v1.0.0
+
+[Unreleased]: https://github.com/dgraph-io/dgraph-js/tree/master