docs(*) release process

RELEASE.md

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+# Release
+
+To release new version of Kuma follow the steps:
+
+1. Create a CHANGELOG.md.
+2. Double-check with changelog that all new features are documented on kuma.io website.
+3. Create PR to [kuma.io website repository](https://github.com/Kong/kuma-website) with new download links and the new version.
+4. Create a new git tag.
+5. Push git tag. This will trigger the release job on CI.
+6. Make sure that new binaries are available in [Bintray](https://bintray.com/kong/kuma).
+7. Download the new Kuma version and double check that it works with demo app. Check that is works both in `universal` and `kubernetes` modes.
+8. Merge PR to website repository.
+9. Create a new [Github release](https://github.com/Kong/kuma/releases)
+10. Announce new version on Kuma Slack #news channel.
+
+## Major releases
+For major releases make sure that you also:
+
+1. Create a blog post on Kong's blog.
+2. Send newsletter about new release.