add release checklist, to remember what all needs to happen

!460
admin#13

RELEASE_CHECKLIST.md

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+
+# Release Checklist
+
+This is the things that need to happen for all releases, alpha or stable:
+
+* pull translations from Weblate: ./tools/pull-trans.sh
+
+* rebase Weblate in its web interface, since we squash commits
+
+* update `versionCode` in _app/build.gradle_
+
+* make signed tag with version name
+
+* update _metadata/org.fdroid.fdroid.txt_ in _fdroiddata_
+
+## Stable releases
+
+For stable releases, there are a couple more steps to do __before__
+making the release tag:
+
+* update CHANGELOG.md
+
+* run `./tools/trim-incomplete-translations-for-release.py`