added missing header

Signed-off-by: Neil South <[email protected]>

Author: neildsouth

src/InformaticsGateway/Services/HealthLevel7/MllpService.cs

@@ -1,4 +1,20 @@
-using System;
+/*
+ * Copyright 2023 MONAI Consortium
+ *
+ * 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.
+ */
+
+using System;
 using System.Net;
 using System.Net.Sockets;
 using System.Text;