Modify README

Author: KangLin

README.md

@@ -19,6 +19,7 @@ Author: Kang Lin (kl222@126.com)
 [![Download SerialPortAssistant](https://img.shields.io/sourceforge/dt/serialportassistant.svg?label=Sourceforge%20downloads)](https://sourceforge.net/projects/serialportassistant/files/latest/download)
 
 [![build](https://github.com/KangLin/SerialPortAssistant/actions/workflows/build.yml/badge.svg)](https://github.com/KangLin/SerialPortAssistant/actions/workflows/build.yml)
+[![Build status](https://ci.appveyor.com/api/projects/status/y77e828ysqc79r9o?svg=true)](https://ci.appveyor.com/project/KangLin/serialportassistant)
 
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README_zh_CN.md

@@ -19,6 +19,7 @@
 [![Download SerialPortAssistant](https://img.shields.io/sourceforge/dt/serialportassistant.svg?label=Sourceforge%20下载量)](https://sourceforge.net/projects/serialportassistant/files/latest/download)
 
 [![build](https://github.com/KangLin/SerialPortAssistant/actions/workflows/build.yml/badge.svg)](https://github.com/KangLin/SerialPortAssistant/actions/workflows/build.yml)
+[![Build status](https://ci.appveyor.com/api/projects/status/y77e828ysqc79r9o?svg=true)](https://ci.appveyor.com/project/KangLin/serialportassistant)
 
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