doc: add docs

README.md

@@ -1,4 +1,51 @@
 # DSF - Dead Simple Fileserver
 
+[![Go Reference](https://pkg.go.dev/badge/github.com/nanmu42/dsf.svg)](https://pkg.go.dev/github.com/nanmu42/dsf)
+[![Go Report Card](https://goreportcard.com/badge/github.com/nanmu42/dsf)](https://goreportcard.com/report/github.com/nanmu42/dsf)
 
+**English** | [中文](https://github.com/nanmu42/dsf/blob/main/README.zh-cn.md)
 
+A dead simple HTTP fileserver to share your files across LAN.
+
+Yes, `python3 -m http.server` will do, but sometimes I got bitten by its single-threaded nature.
+
+## Usage
+
+```
+$ dsf -h
+Usage of dsf:
+  -port int
+    	listening port (default 8080)
+  -root string
+    	root for files (default "./")
+```
+
+Serve current working directory:
+
+```bash
+$ dsf
+listening on: http://127.0.0.1:8080
+listening on: http://::1:8080
+```
+
+Serve a specific directory and listen on a desired port:
+
+```bash
+$ dsf -port 3000 -root ~/images
+listening on: http://127.0.0.1:3000
+listening on: http://::1:3000
+```
+
+## Installation
+
+Precompiled binaries are available for Linux, Mac and Windows: https://github.com/nanmu42/dsf/releases/
+
+For gophers:
+
+```bash
+go install github.com/nanmu42/dsf
+```
+
+## License
+
+MIT

README.zh-cn.md

@@ -0,0 +1,53 @@
+# DSF - 极简文件服务
+
+[![Go Reference](https://pkg.go.dev/badge/github.com/nanmu42/dsf.svg)](https://pkg.go.dev/github.com/nanmu42/dsf)
+[![Go Report Card](https://goreportcard.com/badge/github.com/nanmu42/dsf)](https://goreportcard.com/report/github.com/nanmu42/dsf)
+
+[English](https://github.com/nanmu42/dsf) | **中文**
+
+一个非常简单的HTTP文件服务，可以把本地的文件暴露到局域网上。
+
+虽然`python3 -m http.server`也能用，但是有时我没法接受它单线程一次只能服务一个文件的特性。
+
+## 用法
+
+```
+$ dsf -h
+dsf 的用法:
+  -port int
+    	监听端口 (默认 8080)
+  -root string
+    	文件根目录 (默认 "./")
+```
+
+分享当前工作目录：
+
+```bash
+$ dsf
+listening on: http://127.0.0.1:8080
+listening on: http://::1:8080
+```
+
+在特定端口分享特定目录：
+
+```bash
+$ dsf -port 3000 -root ~/images
+listening on: http://127.0.0.1:3000
+listening on: http://::1:3000
+```
+
+## 安装
+
+适用于Linux, Mac 和 Windows预编译二进制可以在这里找到：https://github.com/nanmu42/dsf/releases/
+
+Gophers 可以这样安装：
+
+```bash
+go install github.com/nanmu42/dsf
+```
+
+使用愉快！
+
+## License
+
+MIT