Add checklist for RCs

Release-checklist.md

@@ -40,6 +40,17 @@ Note that some of these can be done concurrently.
 1. Hype
 	- TASVideos news, Discord, etc.
 
+### Release candidates
+
+The same steps, but abridged.
+1. Merge PRs
+1. Re-triage Issues
+1. Write changelog
+1. Push `release` (+ download and repackage builds)
+1. Run VirusTotal
+1. Create Release (+ tag)
+1. That's it. Don't touch `VersionInfo.MainVersion`.
+
 ### Changelog structure
 (see "Write the changelog" above)