adds a root changelog (#4009)

* adds a root changelog * Update CHANGELOG.md Co-authored-by: Feiyang <[email protected]>
firebase · Oct 29, 2020 · de5237f · de5237f
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+# Changelog
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+You can view the changelog for the packages within this monorepo in `packages/<package name>/CHANGELOG.md`. For example, you will find the changelog for the Firestore package at [`packages/firestore/CHANGELOG.md`](./packages/firestore/CHANGELOG.md).
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+Additionally, you can view our official release notes for the entire monorepo at the [firebase support page](https://firebase.google.com/support/release-notes/js).