添加自我描述文档，安装和用法

README.md

@@ -1,2 +1,73 @@
 # php-func
 
+PHP 通用函数库及别名定义，按需加载
+
+
+
+## Install
+
+```sh
+composer require wuding/php-func
+```
+
+
+
+## Usage
+
+### func
+
+func - 定义函数别名
+
+
+
+#### 说明
+
+```php
+func ( mixed $function_config [, array $alias_classes = array() [ , mixed $... ]] ) : void
+```
+
+单独或批量定义函数别名，并预设参数默认值
+
+
+
+#### 参数
+
+**function_config**
+
+要调用或声明的原始函数（名），也可以是批量配置
+
+**alias_classes**
+
+要定义的函数别名或依赖哪些类
+
+**...**
+
+函数的参数
+
+
+
+#### 范例
+
+bootstrap.php
+
+
+```php
+$Composer = require APP_PATH . '/../vendor/autoload.php';
+
+$functions = [
+    '_isset' => ['', [], '', null],
+    '\Func\array_diff_kv' => ['', [], [], [], false],
+    '\Func\Arr::diff' => ['\Func\diff', [], [], [], false],
+    'str_match' => ['', '//', '', null, false],
+    'wtf' => [function ($text) { return $text; }, 'hi'],
+];
+
+func($functions, ['Variable', 'Arr', 'PCRE']);
+func('\Func\Str\unicode_decode', '', [], [], [], false);
+new \Func\Alias('test', function ($text) { return $text; }, 'test');
+
+echo str_match('/^\d+元/', '3元', '1角', true);
+echo unicode_decode('\u65b0\u6d6a\u5fae\u535a', 'json');
+echo test('str');
+```
+

composer.json

@@ -1,7 +1,7 @@
 {
   "name": "wuding/php-func",
   "description": "PHP function polyfill",
-  "keywords": ["Function", "Polyfill"],
+  "keywords": ["Function", "Polyfill", "Shim"],
   "license": "BSD-3-Clause",
   "authors": [
     {