Add CacheLayer singleton class

src/Socialbox/Classes/CacheLayer.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Socialbox\Classes;
+
+class CacheLayer
+{
+    private static CacheLayer $instance;
+
+    public static function getInstance(): CacheLayer
+    {
+        if (!isset(self::$instance))
+        {
+            self::$instance = new CacheLayer();
+        }
+
+        return self::$instance;
+    }
+}