added tournament mappool api call

src/Controller/API/Tournament/APITournamentController.php

+<?php
+
+namespace App\Controller\API\Tournament;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\Routing\Annotation\Route;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpClient\HttpClient;
+
+use App\Entity\Song;
+
+class APITournamentController extends AbstractController
+{
+    /**
+     * @Route("/api/tournament/mappool", name="api.tournament.mappool")
+     */
+    public function tournamentMappool()
+    {
+        $em = $this->getDoctrine()->getManager();
+        $data = [];
+
+        // Botch
+        $tournamentCharts = $em->getRepository(Song::class)->findBy(array('isTournament' => true));
+
+        foreach($tournamentCharts as $tournamentChart) {
+            $data[] = $tournamentChart->getJSON();
+        }
+
+        $response = new JsonResponse(['version' => $this->getParameter('api_version'), 'status' => 200, 'data' => $data]);
+        $response->headers->set('Access-Control-Allow-Origin', '*');
+        return $response;
+    }
+}