Kotlin Notes
https://github.com/JetBrains/kotlin
https://www.gitbook.com/book/huanglizhuo/kotlin-in-chinese/details
https://wangjiegulu.gitbooks.io/kotlin-for-android-developers-zh/content/
https://panxl6.gitbooks.io/kotlin-in-action-in-chinese/content/welcome.html
https://kymjs.com/column/kotlin.html
https://github.com/enbandari/Kotlin-Tutorials
http://ragnraok.github.io/using-kotlin-to-write-android-app.html
http://androidwing.net/index.php/89
https://github.com/YeungKC/Gank.io-for-Kotlin-Android
https://github.com/githubwing/GankClient-Kotlin
https://github.com/wuapnjie/PoiShuhui-Kotlin
https://github.com/nekocode/Kotlin-Android-Template