add english translation

Author: adaex

README.md

@@ -5,37 +5,39 @@
 [![npm downloads](https://img.shields.io/npm/dm/coa-error.svg?style=flat-square)](http://npm-stat.com/charts.html?package=coa-error)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](https://github.com/coajs/coa-error/pulls)
 
-COA 框架基础错误类，用于统一化错误提示
+English | [简体中文](README.zh-CN.md)
 
-### 安装
+Basic Error Library for coajs, used to unify error messages
+
+### Install
 
 ```shell
 yarn add coa-error
 ```
 
-### 使用示例
+### Example
 
 ```typescript
 import { CoaError } from 'coa-error'
 
-// 定义并抛出一个新的错误
-throw new CoaError('User.UserAgeInvaild', '用户年龄错误')
+// Define and throw a new error
+throw new CoaError('User.UserAgeInvaild', 'User age error')
 
-// 使用静态方法抛出（可以当做一个语法糖）
-CoaError.throw('User.UserAgeInvaild', '用户年龄错误')
+// Thrown using a static method (can be used as a syntax sugar)
+CoaError.throw('User.UserAgeInvaild', 'User age error')
 
-// 也可以使用message方法，仅仅提示不在stdio显示（由coa上层框架控制，框架外部调用等同于throw）
-CoaError.message('User.UserAgeInvaild', '用户年龄错误')
+// You can also use the message method, which only prompts but does not display in stdio (controlled by the coa upsteam framework, other calls are equivalent to throw)
+CoaError.message('User.UserAgeInvaild', 'User age error')
 ```
 
-### 数据结构
+### Data structure
 
-COA 错误要求必须定义如下统一参数：
+coa error requires that the following uniform parameters must be defined:
 
-- **code** 错误代码，
-- **message** 错误消息
+- **code** error code
+- **message** error message
 
-类定义如下
+The class is defined as follows:
 
 ```typescript
 class CoaError extends Error {

README.zh-CN.md

@@ -0,0 +1,63 @@
+# coa-error
+
+[![GitHub license](https://img.shields.io/badge/license-MIT-green.svg?style=flat-square)](LICENSE)
+[![npm version](https://img.shields.io/npm/v/coa-error.svg?style=flat-square)](https://www.npmjs.org/package/coa-error)
+[![npm downloads](https://img.shields.io/npm/dm/coa-error.svg?style=flat-square)](http://npm-stat.com/charts.html?package=coa-error)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](https://github.com/coajs/coa-error/pulls)
+
+[English](README.md) | 简体中文
+
+COA 框架基础错误类，用于统一化错误提示
+
+### 安装
+
+```shell
+yarn add coa-error
+```
+
+### 使用示例
+
+```typescript
+import { CoaError } from 'coa-error'
+
+// 定义并抛出一个新的错误
+throw new CoaError('User.UserAgeInvaild', '用户年龄错误')
+
+// 使用静态方法抛出（可以当做一个语法糖）
+CoaError.throw('User.UserAgeInvaild', '用户年龄错误')
+
+// 也可以使用message方法，仅仅提示但不在stdio显示（由coa上层框架控制，其他方式调用等同于throw）
+CoaError.message('User.UserAgeInvaild', '用户年龄错误')
+```
+
+### 数据结构
+
+COA 错误要求必须定义如下统一参数：
+
+- **code** 错误代码
+- **message** 错误消息
+
+类定义如下：
+
+```typescript
+class CoaError extends Error {
+  name = 'CoaError'
+
+  code: string
+  stdout: boolean
+
+  constructor(code: string, message: string, stdout: boolean = true) {
+    super(message)
+    this.code = code
+    this.stdout = stdout
+  }
+
+  static message(code: string, message: string): never {
+    throw new CoaError(code, message, false)
+  }
+
+  static throw(code: string, message: string): never {
+    throw new CoaError(code, message)
+  }
+}
+```