add description

Author: TianpeiLee

README.md

@@ -3,6 +3,7 @@
 * [Introduction](https://github.com/openwch/arduino_core_ch32#Introduction)<br>
 * [How to use](https://github.com/openwch/arduino_core_ch32#How-to-use)<br>
 * [Supported boards](https://github.com/openwch/arduino_core_ch32#Supported-boards)<br>
+* [OS support](https://github.com/openwch/arduino_core_ch32#OS-support)<br>
 * [Submit bugs](https://github.com/openwch/arduino_core_ch32#Submit-bugs)<br>
 
 ## Introduction
@@ -64,6 +65,50 @@ It will be a long-term support and maintenance project, unless we encounter forc
 | :----: |     ----    |     ----    | :-----: | :---- |
 | :heavy_check_mark: | CH32V307VCT6_BLACK | ADC,DAC,USART,GPIO,EXTI,SysTick,SPI,I2C_Master | 1.0.3 | - |
 
+
+## OS support
+
+Adopting toolchain and openocd under [MRS](http://www.mounriver.com/), supporting HPE, custom byte and half-word compression extensions,"upload" via WCH_LINKE. 
+
+**Most importantly, the version of Arduino IDE is 2.0+.**
+
+### Win
+
+If you encounter an error during upload, please confirm that the version of your WCH-LINKE is consistent with the latest version under MRS. 
+WCH-LINKE related information can [refer to this link](https://github.com/openwch/ch32v307/tree/main/WCH-Link). 
+
+### Linux
+
+For Linux, after installing the support package for the first time, to ensure the normal upload function, 
+please open the packages installation path of the Arduino IDE, run the script, and automatically configure the environment.
+
+Usually, it can be operated as follows:<br>
+
+```bash
+cd ~/.arduino15/packages/WCH/tools/beforeinstall/1.0.0
+./start.sh
+```
+After authorization, it will copy or generate some necessary libraries and rules:
+
+```text
+Copy Libs
+[sudo] password for temperslee: 
+Register new Libs
+copy rules
+Reload rules
+DONE
+```
+
+### MAC
+
+For MAC, please install the "libusb" library before starting to use it.
+```bash
+brew install libusb
+```
+If "libusb" related errors still occur when "uploading" firmware after installing the libusb library, 
+please contact the **MRS team** for assistance through "*[email protected]*".
+
+
 ## Submit bugs
 
 If you have any questions, you could contact me through the email "*[email protected]*".