Add README

Signed-off-by: Bigbits <btx000@qq.com>

README.md

@@ -1,5 +1,4 @@
 # Arduino Core for Kendryte K210
-----
 ## Windows
 ### 1.首选项添加下列地址 然后打开开发版管理器下载开发包
 >https://bigbits.oss-cn-qingdao.aliyuncs.com/Arduino_for_k210/package_k210_index.json
@@ -19,4 +18,26 @@
 >pip3 install pyserial
 ### 4.开发板选择Sipeed M1 Board 编程器选 k-flash
 ### 5.连接开发板选对应的串口号
-### 6.编写程序 编译 上传 完成
+### 6.编写程序 编译 上传 完成
+----
+## Windows
+### 1.Add the following address to the **Preferences** and open the **Boards Manager** to download the development kit.
+>https://bigbits.oss-cn-qingdao.aliyuncs.com/Arduino_for_k210/package_k210_index.json
+### 2.Add the toolchain directory to the PATH environment variable after installation.
+>C:\Users\\**(username)**\AppData\Local\Arduino15\packages\Kenduino\tools\riscv64-unknown-elf-gcc\8.2.0\bin
+### 3.Install [.Net core runtime](https://download.visualstudio.microsoft.com/download/pr/3f05ee2d-5372-43d6-9562-be86632a53d4/1361281426efa7ff206289adb0411f55/dotnet-runtime-3.0.0-preview3-27503-5-win-x64.exe)
+### 4.Board selects Sipeed M1 Board & Programmer to choose k-flash.
+### 5.Connect the development board and then choose the serial port.
+### 6.Now you can write the Arduino code and upload it to the k210 board.
+----
+## Ubuntu
+### 1.Add the following address to the **Preferences** and open the **Boards Manager** to download the development kit.
+>https://bigbits.oss-cn-qingdao.aliyuncs.com/Arduino_for_k210/package_k210_index.json
+### 2.Enter the following command in the terminal to solve the problem of usb serial port access rights.
+>sudo usermode -a -G dialout **(username)**
+### 3.Install pyserial
+>pip3 install pyserial
+### 4.Board selects Sipeed M1 Board & Programmer to choose k-flash.
+### 5.Connect the development board and then choose the serial port.
+### 6.Now you can write the Arduino code and upload it to the k210 board.
+----