Add release checklist (RELEASE.md)

RELEASE.md

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+# Release Checklist
+
+## Release Type
+- Were there any database schema changes?
+- Are there any significant UI changes?
+- Have any significant new features been added?
+- Are there any API changes?
+
+If the answer to any of the above is yes, then the release MUST be a major or minor release. Otherwise, the release MAY be a patch release (at developer's discretion).
+
+## Major/Minor Releases
+- [ ] Add a commit which adds a database upgrade script at `db/upgrade/[oldversion]-[newversion].sql`
+  - ALWAYS use a transaction for the entirety of this file
+  - At minimum, DB version must be bumped
+- [ ] Add a commit which bumps the version in `app/version.ts` and `db/00-version.sql`
+- [ ] Tag the latest commit with `vMAJOR.MINOR`
+
+## Patch Releases
+- [ ] Add a commit which bumps the patch level in `app/version.ts`
+- [ ] Tag the latest commit with `vMAJOR.MINOR.PATCH`