update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/readme/distributed-hardware.md

+# Distributed Hardware
+
+## Introduction
+
+### **Distributed Hardware Subsystem**
+
+The distributed hardware subsystem manages hardware information of all the devices in a Super Device so that the hardware capabilities can be shared and called across devices.
+
+### Architecture
+
+![Distributed Hardware Subsystem](figures/distributed-hardware-subsystem.png)
+
+## Directory Structure
+
+```
+foundation/distributedhardware
+├──device_manager                     # Directory of DeviceManager.
+├──distributed_hardware_fwk           # Directory of the distributed hardware framework.
+├──distributed_camera                 # Directory of the distributed camera component. 
+└──distributed_screen                 # Directory of the distributed screen component.
+```
+
+## Component Description
+
+### DeviceManager
+
+DeviceManager provides authentication and networking for devices of a Super Device, including discovering distributed devices, performing authentication, and listening for device online/offline status.
+
+### Distributed Hardware Framework
+
+As an information management component of the distributed hardware subsystem, the distributed hardware framework implements unified hardware access, information query, and hardware enablement.
+
+### Distributed Camera
+
+The distributed camera component implements collaboration of cameras of multiple devices that form a Super Device. Instead of directly interacting with applications, the distributed camera component only provides C++ interfaces for the distributed hardware framework. Applications can call the APIs of the camera framework to use the distributed camera component to operate cameras of other devices, just like operating a local camera.
+
+### Distributed Screen
+
+The distributed screen provides a screen virtualization capability, which allows the screen of another authenticated device to be used as a display. In the distributed hardware subsystem, the distributed screen component implements system projection, screen mirroring, and screen splitting across the devices that form a Super Device.
+
+## Repositories Involved
+
+[distributedhardware\_device\_manager](https://gitee.com/openharmony/distributedhardware_device_manager)
+
+[distributedhardware\_distributed\_hardware\_fwk](https://gitee.com/openharmony/distributedhardware_distributed_hardware_fwk)
+
+[distributedhardware\_distributed\_camera](https://gitee.com/openharmony/distributedhardware_distributed_camera)
+
+[distributedhardware\_distributed\_screen](https://gitee.com/openharmony/distributedhardware_distributed_screen)