Added info in CHANGELOG.md

com.unity.editoriterationprofiler/CHANGELOG.md

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+# Changelog
+All notable changes to this package 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).
+
+## [0.1.0-preview] - 2020-04-06
+
+* This is the first public release of the Editor Iteration Profiler package
+
+The Editor Iteration Profiler is an Editor tool which monitors domain reloads.