Add api routes to get/add/remove bids for a user #172

app/Exceptions/BidExists.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ *
+ */
+
+namespace App\Exceptions;
+
+use Symfony\Component\HttpKernel\Exception\HttpException;
+
+class BidExists extends HttpException
+{
+    public function __construct(string $message = null, \Exception $previous = null, int $code = 0, array $headers = [])
+    {
+        parent::__construct(
+            409,
+            'A bid already exists for this flight',
+            $previous, $headers, $code
+        );
+    }
+}