docs: document missing serial mode

Author: BlueGlassBlock

README.md

@@ -79,6 +79,20 @@ By default, an extra 30px is added to the radius to compensate for this.
 
 You can change compensation radius with config `touch.radius_compensation`, which could be positive or negative.
 
+### Serial Mode
+
+Toucca support communicating with serial port to control the game.
+
+You need to bind COM3 and COM5, COM4 and COM6 using [com0com](https://sourceforge.net/projects/com0com/), enabling buffer overrun at the meantime.
+
+Read more about configuration at the [WACVR](https://github.com/xiaopeng12138/WACVR#serial-not-recommended) project.
+
+To enable it, simply set `touch.enable` to `0` to disable the hook-based touch input.
+
+### Disable Toucca
+
+If you want to disable toucca, please don't set `touch.enable` to `0`, instead, set the `path` to a different file.
+
 ## Build Yourself
 
 I have only tried building on Windows since the game is Windows only. :)

README.zh.md

@@ -77,6 +77,20 @@ relative_threshold = 1 # 需要跨越的物理环数才能切换到下一个相
 
 你可以通过 `touch.radius_compensation` 来调整这个值。
 
+### 串口模式
+
+Toucca 支持使用串口模式与游戏通信。
+
+你需要使用 [com0com](https://sourceforge.net/projects/com0com/) 绑定 COM3 和 COM5，COM4 和 COM6，并同时启用缓冲区溢出。
+
+你可以在 [WACVR](https://github.com/xiaopeng12138/WACVR#serial-not-recommended) 项目中了解更多关于配置的信息。
+
+将 `touch.enable` 设置为 `0` 会禁用基于钩子的触摸输入并自动启用串口输入。
+
+# 禁用 Toucca
+
+如果你想禁用 toucca，请不要将 `touch.enable` 设置为 `0`，而是将 `touch.path` 设置为一个不同的文件。
+
 ## 自行构建
 
 我只在 Windows 上进行过构建（毕竟原框体是基于 Windows 的），不过 Linux 应该也能构建。