update README

Author: wujunze

README.md

@@ -1,2 +1,27 @@
 # php-cli-color
 Simple and easy to use the PHP command-line output of color
+
+
+##Installation
+
+composer require lijinma/php-cli-color '~1.0'
+
+##How to use
+```php
+<?php
+
+require_once __DIR__ . './../vendor/autoload.php';
+
+$colors = new Wujunze\Colors();
+// Test some basic printing with Colors class
+echo $colors->getColoredString("Testing Colors class, this is purple string on yellow background.", "purple", "yellow") . PHP_EOL;
+echo $colors->getColoredString("Testing Colors class, this is blue string on light gray background.", "blue", "light_gray") . PHP_EOL;
+echo $colors->getColoredString("Testing Colors class, this is red string on black background.", "red", "black") . PHP_EOL;
+echo $colors->getColoredString("Testing Colors class, this is cyan string on green background.", "cyan", "green") . PHP_EOL;
+echo $colors->getColoredString("Testing Colors class, this is cyan string on default background.", "cyan") . PHP_EOL;
+echo $colors->getColoredString("Testing Colors class, this is default string on cyan background.", null, "cyan") . PHP_EOL;
+```
+
+## run result
+
+![code run result](http://ww4.sinaimg.cn/large/0060lm7Tgy1fdptvr70bdj30nl072zld.jpg)