chore: add README

README.md

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+libLoL
+======
+
+简体中文自述文档请见[此处](README.zh.md)
+
+libLoL (LoongArch on LoongArch) is a compatibility runtime for applications
+designed for LoongArch's old-world ABI. By and large, these are applications
+built for Loongson's Loongnix reference Linux distribution and UnionTech's
+UOS, consisting mostly commercial applications designed for the mainland
+Chinese market, such as:
+
+- Tencent's QQ for Linux
+- Kingsoft's WPS for Linux
+- Loongson Browser (based on Chromium)
+
+As these applications have not yet been ported to the new-world ABI, this
+runtime is meant to provide help users of new-world Linux distributions use
+the aforementioned applications.
+
+For a brief introduction on old-world and new-world incompatibility, please
+refer to [this essay](https://areweloongyet.com/docs/old-and-new-worlds/) (in
+Chinese) from the Loongson Open Source Community's *Are We Loong Yet?* site.
+
+Components
+----------
+
+libLoL consists of two components, one in the kernel-space and the other in
+the user-space.
+
+- Kernel: The [la_ow_syscall](https://github.com/shankerwangmiao/la_ow_syscall)
+  modules provides support for old-world system call support in the Linux
+  Kernel, making it possible to run old-world applications on new-world
+  (upstream) kernels.
+- User-space: A [patched Glibc](https://github.com/AOSC-Dev/glibc-loongarch-oldworld)
+  provides symbol support for old-world applications - see the Autobuild
+  building procedure in this repository. Additional runtime may be provided
+  by the distribution or in binary form from [Loongnix](https://www.loongson.cn/system/loongnix).
+
+Reporting Issues
+----------------
+
+Please use the [Issues](https://github.com/AOSC-Dev/liblol/issues) function
+for reporting any developer or user issues (feel free to use English or
+Chinese).
+
+You are also welcome to report issues at AOSC's various
+[chat groups](https://aosc.io/contact/).

README.zh.md

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+libLoL
+======
+
+libLoL (LoongArch on LoongArch) 是一款用于提供旧世界 ABI 兼容性的运行时。旧世界 ABI 常用于为龙芯官方的 Loongnix 参考发行和统信 UOS 设计的商业软件，如：
+
+- 腾讯 QQ Linux 版
+- 金山 WPS for Linux
+- 龙芯浏览器（基于 Chromium）
+
+由于这些应用程序尚未移植到新世界 ABI 上，本运行时旨在为新世界发行版用户提供运行上述应用程序的便利。欲知有关新旧世界应用不兼容来由的相关信息，请见龙芯开源社区《咱龙了吗？》站点的[《新世界与旧世界》](https://areweloongyet.com/docs/old-and-new-worlds/)一文。
+
+组件
+----
+
+libLoL 由内核空间和用户空间两个组件组成：
+
+- 内核部分：通过 [la_ow_syscall](https://github.com/shankerwangmiao/la_ow_syscall) 模块，给 Linux 内核新增旧世界系统调用支持，进而使得新世界内核得以兼容旧世界运行时和应用程序
+- 用户空间部分：给 [Glibc 打补丁](https://github.com/AOSC-Dev/glibc-loongarch-oldworld)以提供旧世界应用程序所需符号的兼容性。其余运行时库由发行版软件包或 [Loongnix](https://www.loongson.cn/system/loongnix) 的二进制软件包提供。
+
+报告问题
+--------
+
+请使用本仓库的[工单系统](https://github.com/AOSC-Dev/liblol/issues) 报告有关开发和使用方面的问题。您也可以通过我社的[聊天群组](https://aosc.io/zh-cn/contact/)报告问题。