Readme: Add disclaimer and Chinese README (#40)

README.md

@@ -1,12 +1,36 @@
+**English** | [中文](README_CN.md)
+
 # KernelSU
 
 A Kernel based root solution for Android GKI.
 
+## Before Reading
+
+Now KernelSU supports old kernel under 5.10, but **THERE WILL NEVER** be a CI for old kernels, because they are not generic.
+ANY ISSUES ABOUT HOW TO COMPILE A OLD KERNEL WILL NOT BE ANSWERED AND WILL BE CLOSED.
+
+KernelSU is in a early development stage and you should not put it into production enviroment. KernelSU developers will not be responsible for any of your losses.
+
+If you face any issue, feel free to open a [issue](https://github.com/tiann/KernelSU/issues) and tell us about it!
+
+## Compatibility State
+
+Now KernelSU will work on these version of kernels without any modification：
+
+- `5.15`
+- `5.10`
+- `5.4`
+- `4.19`
+
+If you confirm KernelSU works on other version, open a [issue](https://github.com/tiann/KernelSU/issues) tell us about it!
+
 ## Usage
 
 1. Flash a custom kernel with KernelSU, you can build it yourself or [download it from CI](https://github.com/tiann/KernelSU/actions/workflows/build-kernel.yml).
 2. Install Manager App and enjoy :)
 
+For old kernels under 5.10, you must build custom kernels by yourself.
+
 ## Build
 
 ### Build GKI Kernel

README_CN.md

@@ -0,0 +1,60 @@
+[English](README.md) | **中文**
+
+# KernelSU
+
+一个基于内核, 为安卓 GKI 准备的 root 方案.
+
+## 阅读之前
+
+现在 KernelSU 支持 5.10 以下的旧内核, 但**永远不会**有旧内核的CI, 因为它们不是通用的.
+**任何关于如何编译旧内核的问题都不会得到任何答复并将被关闭.**
+
+KernelSU 还处于早期开发阶段, 你不应该生产环境中使用它. KernelSU 的开发者将不对你的任何损失负责.
+
+如果你遇到任何问题, 请打开 [issue](https://github.com/tiann/KernelSU/issues) 告诉我们! (最好使用英语)
+
+## 兼容状态
+
+现在, KernelSU 可以在这些版本的内核上正常工作, 不需要任何修改.
+
+- `5.15`
+- `5.10`
+- `5.4`
+- `4.19`
+
+如果你确认 KernelSU 能在其他版本上工作, 请打开一个 [issue](https://github.com/tiann/KernelSU/issues) 告诉我们!
+
+## 使用方法
+
+1. 用 KernelSU 刷新一个自定义的内核, 你可以自己构建它或者[从 CI 下载](https://github.com/tiann/KernelSU/actions/workflows/build-kernel.yml).
+2. 安装管理器应用, 然后享受吧 :)
+
+对于 5.10 以下的旧内核, 你必须自己构建.
+
+## 构建
+
+### 构建GKI内核
+
+1. 首先下载 GKI 源代码, 你可以参考[ GKI 构建说明](https://source.android.com/docs/setup/build/building-kernels)
+2. cd `< GKI 内核源代码目录 >`.
+3. `curl -LSs "https://raw.githubusercontent.com/tiann/KernelSU/main/kernel/setup.sh" | bash -`.
+4. 构建内核.
+
+### 构建管理器应用
+
+Android Studio / Gradle
+
+### 讨论
+
+[@KernelSU](https://t.me/KernelSU)
+
+## 许可证
+
+[GPL-3](http://www.gnu.org/copyleft/gpl.html)
+
+## 鸣谢
+
+- [kernel-assisted-superuser](https://git.zx2c4.com/kernel-assisted-superuser/about/): KernelSU 的灵感.
+- [true](https://github.com/brevent/genuine/): apk v2 签名验证.
+- [Diamorphine](https://github.com/m0nad/Diamorphine): 一些rootkit技巧.
+- [Magisk](https://github.com/topjohnwu/Magisk): sepolicy 的实现.