add basic authentication with user, password and api key

src/Api/Core/Response.php

@@ -8,4 +8,15 @@ class Response {
         echo json_encode($data);
         exit;
     }
+
+    public function unauthorized(?string $data = null) {
+        http_response_code(401);
+        header('Content-Type: application/json');
+        header('HTTP/1.1 401 Unauthorized');
+        header('Content-Length: 0');
+        if ($data !== null && $data !== '') {
+            echo json_encode($data);
+        }
+        exit;
+    }
 }