Add RELEASE.md

Author: bufdev

RELEASE.md

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+# Releasing
+
+This document outlines how to create a release of bufplugin-go.
+
+1. Clone the repo, ensuring you have the latest main.
+
+2. Review all commits in the new release and for each PR check an appropriate label is used and edit
+   the title to be meaningful to end users.
+
+3. Using the Github UI, create a new release.
+
+   - Under “Choose a tag”, type in “vX.Y.Z” to create a new tag for the release upon publish.
+   - Target the main branch.
+   - Title the Release “vX.Y.Z”.
+   - Click “set as latest release”.
+   - Set the last version as the “Previous tag”.
+   - Edit the release notes.
+
+4. Publish the release.