Add release file

RELEASE.md

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+Release type: minor
+
+This release changes some of the internals of Strawberry, it shouldn't
+be affecting most of the users, but since we have changed the structure
+of the code you might need to update your imports.
+
+Thankfully we also provide a codemod for this, you can run it with:
+
+```bash
+strawberry upgrade update-imports
+```
+
+This release also includes additional documentation to some of
+the classes, methods and functions, this is in preparation for
+having the API reference in the documentation ✨

TWEET.md

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+🆕 Release $version is out! Thanks to $contributor for the PR 👏
+
+This release updates some of the internals to make the codebase more
+maintainable and easier to work with. It also adds improves some of the
+docstrings in preparation for having the API references on our website 📚
+
+Get it here 👉 $release_url