Separated laravel app to its own folder (#540)

api/app/Exceptions/EmailTakenException.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Exceptions;
+
+use Exception;
+
+class EmailTakenException extends Exception
+{
+    /**
+     * Render the exception as an HTTP response.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Illuminate\Http\Response
+     */
+    public function render($request)
+    {
+        return response()->view('oauth.emailTaken', [], 400);
+    }
+}