add a4 paper airplane in opensource.md

Signed-off-by: ncerzzk <huangcmzzk@gmail.com>

Author: Ncerzzk

en/open-source.md

@@ -36,6 +36,15 @@ Here are the open source projects maintained by HumpbackLab:
 - [Fix PWM issue of esp8266 device when duty is 0 (#2684)](https://github.com/ExpressLRS/ExpressLRS/commit/43b97c08ecde07dc40e59b410dffaf1683da859c)
 - [clear all form data before updating hardware setting (#2780)](https://github.com/ExpressLRS/ExpressLRS/commit/132ab0e14bf32dcb6451da2dc6362215f0f2b0cb)
 
+
+## Mechanical Design
+
+### A4 Paper Airplane Remote Control Mount
+- **Project Description**: A 3D-printed mount for converting A4 paper airplanes into remote-controlled aircraft
+- **Link**: [https://makerworld.com.cn/zh/models/2263294-a4zhi-yao-kong-zhi-fei-ji-ji-jia#profileId-2547856](https://makerworld.com.cn/zh/models/2263294-a4zhi-yao-kong-zhi-fei-ji-jia#profileId-2547856)
+- **Technology Stack**: 3D Printing, SolidWorks
+- **Introduction**: A lightweight 3D-printed mount specifically designed for A4 paper airplanes that can quickly convert a regular folded A4 paper airplane into a remote-controlled aircraft, supporting servo and small motor installation.
+
 ## Open Source Licenses
 
 All our open source projects follow appropriate open source licenses. Please refer to the LICENSE file in each project for details.

open-source.md

@@ -37,6 +37,14 @@
 - [clear all form data before updating hardware setting (#2780)](https://github.com/ExpressLRS/ExpressLRS/commit/132ab0e14bf32dcb6451da2dc6362215f0f2b0cb)
 
 
+## 机械设计
+
+### A4纸遥控飞机支架
+- **项目描述**: 用于将A4纸飞机改装成遥控飞行器的3D打印支架
+- **链接**: [https://makerworld.com.cn/zh/models/2263294-a4zhi-yao-kong-zhi-fei-ji-ji-jia#profileId-2547856](https://makerworld.com.cn/zh/models/2263294-a4zhi-yao-kong-zhi-fei-ji-jia#profileId-2547856)
+- **技术栈**: 3D打印, SolidWorks
+- **简介**: 专为A4纸飞机设计的轻量化3D打印支架，可快速将普通A4纸折叠飞机转换为遥控飞行器，支持舵机和小型电机安装。
+
 ## 开源许可证
 
 我们所有的开源项目都遵循相应的开源许可证，详情请参阅各项目的 LICENSE 文件。