Add build badges to readme

Author: th-ch

readme.md

@@ -2,6 +2,8 @@
 [![GitHub release](https://img.shields.io/github/release/th-ch/youtube-music.svg)](https://GitHub.com/th-ch/youtube-music/releases/)
 [![GitHub license](https://img.shields.io/github/license/th-ch/youtube-music.svg)](https://github.com/th-ch/youtube-music/blob/master/LICENSE)
 [![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/sindresorhus/xo)
+[![Build status](https://ci.appveyor.com/api/projects/status/tgre12r150ynvwl2?svg=true)](https://ci.appveyor.com/project/th-ch/youtube-music)
+[![Build Status](https://travis-ci.org/th-ch/youtube-music.svg?branch=master)](https://travis-ci.org/th-ch/youtube-music)
 
 ![Screenshot](screenshot.jpg "Screenshot")