Add CHANGELOG file

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).
+
+## [Unreleased]
+
+## [1.0.0] - 2020-06-25
+
+- Rename export to `MetaMaskOnboarding` (#32, **breaking**)
+- Update example in README with validated HTML (#30)
+
+[Unreleased]:https://github.com/MetaMask/metamask-onboarding/compare/v1.0.0...HEAD
+[1.0.0]:https://github.com/MetaMask/metamask-onboarding/tree/v1.0.0