notes on how to do upstream merges

CONTRIBUTING.md

@@ -446,3 +446,28 @@ marginはそのコンポーネントを使う側が設定する
 
 ### indexというファイル名を使うな
 ESMではディレクトリインポートは廃止されているのと、ディレクトリインポートせずともファイル名が index だと何故か一部のライブラリ？でディレクトリインポートだと見做されてエラーになる
+
+## Merging from Misskey into Sharkey
+
+Make sure you have both remotes in the same clone (`git remote add misskey
+https://github.com/misskey-dev/misskey.git`), then:
+
+	git remote update
+	git checkout develop   # this is Sharkey's develop
+	git checkout -m merge/$(date +%Y-%m-%d)   # or whatever
+	git merge --no-ff misskey/develop
+
+fix conflicts and *commit*!
+
+*after that commit*, do all the extra work, on the same branch:
+
+* copy all changes:
+  * from `NoteCreateService` to `NoteEditService`
+  * from `ApNoteService.createNote` to `ApNoteService.updateNote`
+  * from `endoints/notes/create.ts` to `endoints/notes/edit.ts`
+  * from `MkNote*` to `SkNote*` (if sensible)
+* run tests `pnpm test` and fix as much as you can
+* run lint `pnpm --filter=backend lint` + `pnpm --filter=frontend
+  eslint` and fix as much as you can
+
+Then push and open a Merge Request.