Add CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+The format of this document is inspired by [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) and the project follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+<!-- This is a comment, you won't see it when GitHub renders the Markdown file.
+
+When releasing a new version:
+
+1. Remove any empty section (those with `_None._`)
+2. Update the `## Unreleased` header to `## [<version_number>](https://github.com/wordpress-mobile/WordPressKit-iOS/releases/tag/<version_number>)`
+3. Add a new "Unreleased" section for the next iteration, by copy/pasting the following template:
+
+## Unreleased
+
+### Breaking Changes
+
+_None._
+
+### New Features
+
+_None._
+
+### Bug Fixes
+
+_None._
+
+### Internal Changes
+
+_None._
+
+-->
+
+## Unreleased
+
+### Breaking Changes
+
+_None._
+
+### New Features
+
+_None._
+
+### Bug Fixes
+
+_None._
+
+### Internal Changes
+
+_None._