kotlin简介
https://mp.weixin.qq.com/s?__biz=MzI2OTQxMTM4OQ==&mid=2247484919&idx=1&sn=a5515ee4ecfae912ff612295f36a0bf9
Kotlin 的委托和委托属性
https://coyee.com/article/12247-kotlin-delegation-and-delegated-properties
Square Open Source ♥s Kotlin
https://medium.com/square-corner-blog/square-open-source-loves-kotlin-c57c21710a17
Using Project Kotlin for Android
https://docs.google.com/document/d/1ReS3ep-hjxWA8kZi0YqDbEhCqTt29hG8P44aA9W0DM8/edit
主题学习资料：https://zhuanlan.zhihu.com/p/27285806
kotlin文档
https://github.com/mcxiaoke/kotlin-notes
github地址
1：https://github.com/JetBrains/kotlin
kotlin官方地址blog
2：https://blog.jetbrains.com/kotlin/2016/02/kotlin-1-0-released-pragmatic-language-for-jvm-and-android/
3：kotlin官方学习文档
https://kotlinlang.org/docs/tutorials/
https://kotlinlang.org/docs/tutorials/kotlin-android.html
4：kotlon基础文档
英文版本：https://kotlinlang.org/docs/reference/basic-types.html
中文版本：https://www.kotlincn.net/docs/reference/basic-types.html
kotlin论坛：
https://discuss.kotlinlang.org/t/concurrency-in-kotlin/858
