add cli test

Author: wujunze

example/test.php

@@ -0,0 +1,17 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: wujunze
+ * Date: 2017/3/17
+ * Time: 下午2:15
+ */
+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;