Added basic API class

Author: Geolim4

src/phpFastCache/Api.php

@@ -0,0 +1,58 @@
+<?php
+/**
+ *
+ * This file is part of phpFastCache.
+ *
+ * @license MIT License (MIT)
+ *
+ * For full copyright and license information, please see the docs/CREDITS.txt file.
+ *
+ * @author Khoa Bui (khoaofgod)  <[email protected]> http://www.phpfastcache.com
+ * @author Georges.L (Geolim4)  <[email protected]>
+ *
+ */
+
+namespace phpFastCache;
+
+/**
+ * Class Api
+ * @package phpFastCache
+ */
+class Api
+{
+    protected static $version = '1.1.0';
+
+    /**
+     * This method will returns the current
+     * API version, the API version will be
+     * updated by following the semantic versioning
+     * based on changes of:
+     * - ExtendedCacheItemPoolInterface
+     * - ExtendedCacheItemInterface
+     *
+     * @see  http://semver.org/
+     * @return string
+     */
+    public static function getVersion()
+    {
+        return self::$version;
+    }
+
+    /**
+     * Return the API changelog, as a string.
+     * @return string
+     */
+    public static function getChangelog()
+    {
+        return <<<CHANGELOG
+- 1.1.0
+-- Implemented JSON methods such as:
+   ExtendedCacheItemPoolInterface::getItemsAsJsonString()
+   ExtendedCacheItemPoolInterface::getItemsByTagsAsJsonString()
+   ExtendedCacheItemInterface::getDataAsJsonString()
+
+- 1.0.0
+-- First initial version
+CHANGELOG;
+    }
+}