Update README.md

README.md

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 # Groove-Coaster-2OS-Server
 
-A small local server for `Groove Coaster 2: Original Style`, implemented with `Python` and `Flask`. 
+A small local server for `Groove Coaster 2: Original Style`, implemented with `Python` and ~~Flask~~ `Starlette`. 
 
-一个基于`Python`和~~`Flask`~~`Starlette`的微型`Groove Coaster 2: Original Style`本地服务器。
+一个基于`Python`和~~Flask~~`Starlette`的微型`Groove Coaster 2: Original Style`本地服务器。
 
 <details>
 <summary>English</summary>
@@ -235,6 +235,20 @@ If you want to make your service only available to whitelisted devices, turn on
 
 `getCrypt.py` is a standalone script used to decrypt the mass inside the `GET` requests.
 
+## QOL Features
+
+### Save file migration
+
+A `save_id` will be generated upon saving the data to the server. It is available at your user page. You can share it, or input someone else's `save_id`, to have their save file applied to your record.
+
+Note that your old record is not backed up. Thus, this feature should only be used to migrate your own save file, or some save file that you trust.
+
+## Coin Multiplier
+
+A coin multiplier [0, 5] can be set by the user in the user center.
+
+That's about it actually
+
 ## Account System Implementation
 
 Account is only used for save file saving/loading (song ownership and coins are tied to devices. However, songs unlocked in the save file will remain unlocked on a new device). Unlike the official version, you can rename and log out of your account. However, only one device may be connected to an account at a time. The old device will be logged off if a new device logs in.
@@ -481,6 +495,20 @@ PC用文本编辑器打开服务器文件夹的 `config.env`，将`IPV4`填写
 
 `getCrypt.py` 是一个用来单独解密`GET`请求后缀的脚本.
 
+## 质量更新
+
+### 存档迁移
+
+一个 `save_id` 会在保存数据时生成，可在用户中心复制。你可以分享它，也可以输入别人的 `save_id` 来将他们的存档覆盖到你自己的账号下。
+
+小心，你的旧存档不会被备份。因此，此功能仅适合来迁移自己的存档，或者迁移受信任的存档。
+
+## 金币倍数调整
+
+你可以在用户中心调整获得的金币倍数 [0, 5]。
+
+嗯就这些（
+
 ## 账号系统实装
 
 账号仅用于保存/同步存档。Gcoin和歌曲所有权和设备绑定。不过，存档中已经解锁的曲目将在新的设备上可用。官方版不允许重命名及登出账号。私服则可以进行这些操作。不过，一个账号只能同时登陆一台设备，如果登录第二台设备，第一台设备将被挤掉。