update README.md.

Signed-off-by: 随遇而安 <164770707@qq.com>

README.md

@@ -10,11 +10,13 @@
 
 3. 相关硬件
 
+![](https://oscimg.oschina.net/oscnet/up-b12236d9fc6f952b5a4d8856952d7306d9e.png)
+
 |[空气检测仪](https://wumei.live/doc/pages/hardware/)  |   [物联网开发板](https://wumei.live/doc/pages/hardware/)  |  [Air724开发板](https://wumei.live/doc/pages/hardware/)  |  [智能开关](https://wumei.live/doc/pages/hardware/) | [查看更多>>](https://wumei.live/doc/pages/hardware/)  |
 |  :----:  | :----------:  |:----------:  |:----------:  |:----------:  |
 | ![](https://oscimg.oschina.net/oscnet/up-ad98a81677e5e68d660866770e3266ca4cf.png) | ![](https://oscimg.oschina.net/oscnet/up-68caf860d0659444e73f42717a03d2fdf72.png) | ![](https://oscimg.oschina.net/oscnet/up-cf690f6058042dccb567ff382ea9432ebab.png) |![](https://oscimg.oschina.net/oscnet/up-c4a7971510127324d6566dd6ea95d571483.jpg) | ![](https://oscimg.oschina.net/oscnet/up-4ce09be3599e3ff7ed91fe182572abd258b.jpg) | 
 
-![](https://oscimg.oschina.net/oscnet/up-b12236d9fc6f952b5a4d8856952d7306d9e.png)
+
 
 ### 二、系统功能
 - 权限管理： 用户管理、部门管理、岗位管理、菜单管理、角色管理、字典和参数管理等