add bala2 quickstart

docs/en/app/bala2.md

@@ -42,7 +42,7 @@ This Robot is controllable by a Smartphone device or a Transmitter. The BALA2 ba
 
 ## Usage and Sensor calibration
 
-Note: BALA2 has been calibrated , and it can automatically maintain its balance after turning it on. For manual calibration, please refer to [Quick Start](#/en/quick_start/bala2/bala2_quick_start.md)
+Note: BALA2 has been calibrated , and it can automatically maintain its balance after turning it on. For manual calibration, please refer to [Quick Start](en/quick_start/bala2/bala2_quick_start.md)
 
 ## Specification
 

docs/en/quick_start/bala2/bala2_quick_start.md

@@ -6,10 +6,16 @@
 
 2. Press and hold the middle key (ButtonB) and the red button on the left at the same time, and let go immediately after the screen lights up. At this time, IMU data will be obtained. Please do not touch them during this time.
 
+<div class="product_pic"><img src="assets/img/quick_start/bala2/bala_user1.webp"></div>
+
 3. After the data acquisition is completed, it will automatically enter the calibration mode interface. Press the left/right(ButtonA/ButtonC) key to increase or decrease the correction value. When the value is adjusted to a satisfactory value, press the B key to save the parameter.
 
+<div class="product_pic"><img src="assets/img/quick_start/bala2/bala_user2.webp"></div>
+
 4. Restart, BALA2 will run the saved parameters.
 
+<div class="product_pic"><img src="assets/img/quick_start/bala2/bala_user3.webp"></div>
+
 ## Development Environment
 
 [Arduino IDE](#Arduino-IDE)

docs/zh_CN/quick_start/bala2/bala2_quick_start.md

@@ -6,10 +6,16 @@
 
 2. 同时按住中间按键(ButtonB)和左侧红色按键，待屏幕亮起后立刻松手，此时会获取IMU数据，期间请勿触碰。
 
+<div class="product_pic"><img src="assets/img/quick_start/bala2/bala_user1.webp"></div>
+
 3. 数据获取完毕后自动进入校准模式界面，按下A/C键可对修正值增加或减小，当调整至满意值时，按下B键保存参数。
 
+<div class="product_pic"><img src="assets/img/quick_start/bala2/bala_user2.webp"></div>
+
 4. 重新开机，BALA2将已保存的参数运行。
 
+<div class="product_pic"><img src="assets/img/quick_start/bala2/bala_user3.webp"></div>
+
 ## 开发环境
 
 [Arduino IDE编辑](#Arduino-IDE编辑)