Add REVIEW.md with code review guidelines

Co-Authored-By: tom.vanlaerhoven <tom.vanlaerhoven@dolby.com>

Author: devin-ai-integration[bot]

REVIEW.md

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+# Code Review Guidelines
+
+## Tone
+
+- Be **very** concise.
+- Thank the PR author.
+
+## Review format
+
+Start every review with a short poem that begins with an emoji. The poem should be inspired by the changes in the PR.
+
+## Changelog
+
+Every PR that changes runtime behavior **must** include a corresponding entry in `CHANGELOG.md` under `## [Unreleased]`.
+
+The format follows [Keep a Changelog](http://keepachangelog.com/en/1.1.0/):
+
+```md
+## [Unreleased]
+
+### Added
+- Added support for feature X on platform Y.
+
+### Fixed
+- Fixed an issue on Android where Z was not working.
+```
+
+If no changelog entry was added, suggest one and give the author the ability to simply **confirm & commit**.
+
+Documentation-only changes do **not** require a changelog entry.
+
+## CI / E2E tests
+
+Some e2e tests are flaky. If tests fail, rerun them — unless the failure is a **build error**, in which case it should be investigated.
+
+## Labels
+
+Add relevant labels to the PR if they are missing.