Move READMEs to docs (#940)

docs/README.md

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+
+**English** | [Español](README_ES.md) | [简体中文](README_CN.md) | [繁體中文](README_TW.md) | [日本語](README_JP.md) | [Polski](README_PL.md) | [Portuguese-Brazil](README_PT-BR.md) | [Türkçe](README_TR.md) | [Русский](README_RU.md) | [Tiếng Việt](README_VI.md) | [Indonesia](README_ID.md)
+
+# KernelSU
+
+A Kernel-based root solution for Android devices.
+
+## Features
+
+1. Kernel-based `su` and root access management.
+2. Module system based on overlayfs.
+3. [App Profile](https://kernelsu.org/guide/app-profile.html): Lock up the root power in a cage.
+
+## Compatibility State
+
+KernelSU officially supports Android GKI 2.0 devices(with kernel 5.10+), old kernels(4.14+) are also compatible, but you need to build the kernel yourself.
+
+WSA, ChromeOS and container-based Android can also work with KernelSU integrated.
+
+And the current supported ABIs are: `arm64-v8a` and `x86_64`
+
+## Usage
+
+- [Installation Instruction](https://kernelsu.org/guide/installation.html)
+- [How to build?](https://kernelsu.org/guide/how-to-build.html)
+- [Official Website](https://kernelsu.org/)
+
+## Translation
+
+To translate KernelSU into your language or improve an existing translation, please use [Weblate](https://hosted.weblate.org/engage/kernelsu/).
+
+## Discussion
+
+- Telegram: [@KernelSU](https://t.me/KernelSU)
+
+## License
+
+- Files under the `kernel` directory are [GPL-2](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)
+- All other parts except the `kernel` directory are [GPL-3](https://www.gnu.org/licenses/gpl-3.0.html)
+
+## Credits
+
+- [kernel-assisted-superuser](https://git.zx2c4.com/kernel-assisted-superuser/about/): the KernelSU idea.
+- [Magisk](https://github.com/topjohnwu/Magisk): the powerful root tool.
+- [genuine](https://github.com/brevent/genuine/): apk v2 signature validation.
+- [Diamorphine](https://github.com/m0nad/Diamorphine): some rootkit skills.