Added license to the index definitions file

js/ord-schema/index.d.ts

@@ -1,3 +1,19 @@
+/**
+ * Copyright 2024 Open Reaction Database Project Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 import * as Dataset from './proto/dataset_pb';
 import * as Reaction from './proto/reaction_pb';