begin work on some abstractions

structure/abstractions/CacheHandler.js

@@ -0,0 +1,36 @@
+class CacheHandler {
+
+    constructor (client) {
+
+        this.client = client;
+
+    }
+
+    load () {
+        throw new Error('Not implemented');
+    }
+
+    savePersistentCache () {
+        throw new Error('Not implemented');
+    }
+
+    saveModmailHistory () {
+        throw new Error('Not implemented');
+    }
+
+    loadModmailHistory () {
+        throw new Error('Not implemented');
+    }
+
+    get json () {
+        return {
+            queue: this.queue,
+            channels: this.channels,
+            lastActivity: this.lastActivity,
+            misc: this.misc
+        };
+    }
+
+}
+
+module.exports = CacheHandler;