docs: 📝 update README.md

README.md

@@ -1,32 +1,64 @@
 # treei
 
-`treei` 是一个命令函工具，用于生成目录结构的树。
+`treei` is a node command line tool to generate directory structure tree
 
-## 安装
+## Installation
 
 ```bash
 npm i treei -g
 ```
 
-## 使用
+## Usage
 
 ```bash
-treei
+$ treei -h
+Usage: treei [options]
+
+Generate a directory structure tree
+
+Options:
+  -V, --version          output the version number
+  -i, --ignore <ig>      ignore specific directory name
+  -d, --depth <depth>    specify the depth of output
+  -f, --only-folder      output folder only
+  --icon                 output emoji icon, prefixing filename or directory
+  -o, --output <output>  export content into a file
+  -h, --help             display help for command
 ```
 
-## 案例
+## Examples
 
 ```bash
+$ treei -i '.git,node_modules'
 treei
+├──.gitignore
+├──package-lock.json
+├──package.json
+├──README.md
+└──src
+|   └──index.js
 ```
 
-输出:
-
+```bash
+$ treei -i '.git,node_modules' --icon
+treei
+├──📄.gitignore
+├──📄package-lock.json
+├──📄package.json
+├──📄README.md
+└──📁src
+|   └──📄index.js
 ```
+
+```bash
+$ treei -i '.git,node_modules' -o result.md
 treei
-├── .gitignore
-├── package.json
-├── README.md
-└── src
-|  └── index.js
+├──.gitignore
+├──package-lock.json
+├──package.json
+├──README.md
+└──src
+|   └──index.js
+
+# The output has been saved into ./result.md
 ```