Add FileCache driver

app/ServiceProvider/CacheProvider.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Kanboard\ServiceProvider;
+
+use Kanboard\Core\Cache\FileCache;
+use Kanboard\Core\Cache\MemoryCache;
+use Pimple\Container;
+use Pimple\ServiceProviderInterface;
+
+/**
+ * Cache Provider
+ *
+ * @package Kanboard\ServiceProvider
+ * @author  Frederic Guillot
+ */
+class CacheProvider implements ServiceProviderInterface
+{
+    /**
+     * Register providers
+     *
+     * @access public
+     * @param  \Pimple\Container $container
+     * @return \Pimple\Container
+     */
+    public function register(Container $container)
+    {
+        $container['memoryCache'] = function() {
+            return new MemoryCache();
+        };
+
+        if (CACHE_DRIVER === 'file') {
+            $container['cacheDriver'] = function() {
+                return new FileCache();
+            };
+        } else {
+            $container['cacheDriver'] = $container['memoryCache'];
+        }
+
+        return $container;
+    }
+}