add child creation

backend/routes/api.php

@@ -12,5 +12,10 @@ Route::get('/me', [AuthController::class, 'me'])
     ->middleware(AuthMiddleware::class);
 Route::get('/sets', [SetController::class, 'index']);
 Route::get('/elements/{id}', [ElementController::class, 'show']);
+Route::post('/elements/{parentId}/children', [
+    ElementController::class,
+    'createChild',
+])
+    ->middleware(AuthMiddleware::class);
 Route::post('/element/update', [ElementController::class, 'update'])
     ->middleware(AuthMiddleware::class);