Adding REAMDEs to directories

src/Factory/CacheDriverFactory.php

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+<?php
+
+namespace Friendica\Factory;
+
+use Friendica\Core\Cache\ICacheDriver;
+use Friendica\Core\Config;
+use Friendica\Core\Cache;
+
+/**
+ * Class CacheDriverFactory
+ *
+ * @package Friendica\Core\Cache
+ *
+ * A basic class to generate a CacheDriver
+ */
+class CacheDriverFactory
+{
+	/**
+	 * This method creates a CacheDriver for the given cache driver name
+	 *
+	 * @param string $driver The name of the cache driver
+	 * @return ICacheDriver  The instance of the CacheDriver
+	 * @throws \Exception    The exception if something went wrong during the CacheDriver creation
+	 */
+	public static function create($driver) {
+
+		switch ($driver) {
+			case 'memcache':
+				$memcache_host = Config::get('system', 'memcache_host');
+				$memcache_port = Config::get('system', 'memcache_port');
+
+				return new Cache\MemcacheCacheDriver($memcache_host, $memcache_port);
+				break;
+
+			case 'memcached':
+				$memcached_hosts = Config::get('system', 'memcached_hosts');
+
+				return new Cache\MemcachedCacheDriver($memcached_hosts);
+				break;
+			case 'redis':
+				$redis_host = Config::get('system', 'redis_host');
+				$redis_port = Config::get('system', 'redis_port');
+
+				return new Cache\RedisCacheDriver($redis_host, $redis_port);
+				break;
+			default:
+				return new Cache\DatabaseCacheDriver();
+		}
+	}
+}

src/Factory/README.md

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+## Friendica\Factory
+
+This namespace contains Factories.
+A Factory is used to create specific objects based on its configuration.
+
+See [Factory Method](https://designpatternsphp.readthedocs.io/en/latest/Creational/FactoryMethod/README.html)
+
+Use the classes inside this directory if you want to change the way how new objects should get created.
+Don't use the classes to change the behaviour of the concrete objects.