LibWeb/IDB: Implement IDBObjectStore::add

Author: https://github.com/stelar7
Commit: ca1e94f9ea
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4317
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/kennethmyhra ✅

Libraries/LibWeb/IndexedDB/IDBObjectStore.cpp

@@ -317,4 +317,11 @@ WebIDL::ExceptionOr<GC::Ref<IDBRequest>> IDBObjectStore::add_or_put(GC::Ref<IDBO
     return result;
 }
 
+// https://w3c.github.io/IndexedDB/#dom-idbobjectstore-add
+WebIDL::ExceptionOr<GC::Ref<IDBRequest>> IDBObjectStore::add(JS::Value value, Optional<JS::Value> const& key)
+{
+    // The add(value, key) method steps are to return the result of running add or put with this, value, key and the no-overwrite flag true.
+    return add_or_put(*this, value, key, true);
+}
+
 }