refactor

- move elixForms API logic to specific folder
- move everything else under Api folder

src/Api/Controllers/V1/UsersController.php

@@ -0,0 +1,26 @@
+<?php
+namespace Controllers;
+
+use Core\Request;
+use Core\Response;
+
+class UsersController {
+    private $externalService;
+
+    public function __construct(\Services\ExternalApiService $externalService) {
+        $this->externalService = $externalService;
+    }
+
+    public function index(Request $req, Response $res) {
+        return $res->json([
+            'users' => ['Mario', 'Luigi']
+        ]);
+    }
+
+    public function create(Request $req, Response $res) {
+        $data = $req->body();
+        return $res->json([
+            'created' => $data
+        ], 201);
+    }
+}