Add license header to databroker-perf main

Signed-off-by: Dennis Meister <[email protected]>

databroker-perf/src/main.rs

@@ -1,3 +1,16 @@
+/********************************************************************************
+* Copyright (c) 2024 Contributors to the Eclipse Foundation
+*
+* See the NOTICE file(s) distributed with this work for additional
+* information regarding copyright ownership.
+*
+* This program and the accompanying materials are made available under the
+* terms of the Apache License 2.0 which is available at
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* SPDX-License-Identifier: Apache-2.0
+********************************************************************************/
+
 use std::collections::HashMap;
 
 use clap::Parser;