user directory feature added

backend/register.php

@@ -18,8 +18,13 @@ if (isset($postData) && !empty($postData)) {
             'id' => mysqli_insert_id($mysqli),
             'username' => $username
         ];
+        
+        mkdir($authData['id']);
+        
         echo json_encode($authData);
-    } else {
+    } 
+    
+    else {
         echo "mysqli_error($mysqli)";
     }
 }