add stickv schematic

docs/en/core/m5stickv.md

@@ -291,6 +291,10 @@ The triple-axis MEMS accelerometer in MPU-6886 includes a wide range of features
 - Video/Display
 - Game simulator
 
+## Schematic
+
+[K210_CAM](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/schematic/Core/k210_CAMv2.pdf)
+
 ## Links
 
 -  **Web page** - [Sipeed](https://maixpy.sipeed.com/en/)

docs/zh_CN/core/m5stickv.md

@@ -280,6 +280,10 @@ MPU-6886中的三轴MEMS加速度计包括多种功能：
 - 视频/显示
 - 游戏模拟器
 
+## 原理图
+
+[K210_CAM](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/schematic/Core/k210_CAMv2.pdf)
+
 ## 案例程序
 
 -  **Maixpy参考示例** [Example](https://docs.m5stack.com/#/zh_CN/related_documents/M5StickV-Maixpy)