Add audit logging.

app/Support/Logging/AuditLogger.php

@@ -0,0 +1,23 @@
+<?php
+declare(strict_types=1);
+
+namespace FireflyIII\Support\Logging;
+
+/**
+ * Class AuditLogger
+ */
+class AuditLogger
+{
+    /**
+     * Customize the given logger instance.
+     *
+     * @param  \Illuminate\Log\Logger $logger
+     *
+     * @return void
+     */
+    public function __invoke($logger)
+    {
+        $processor  = new AuditProcessor();
+        $logger->pushProcessor($processor);
+    }
+}